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Health SA Gesondheid (Online)

versión On-line ISSN 2071-9736
versión impresa ISSN 1025-9848

Health SA Gesondheid (Online) vol.18 no.1 Cape Town oct. 2013

 

ORIGINAL RESEARCH

 

Evaluation of caregivers' knowledge, beliefs and practices regarding oral lesions in HIV-patients: A pilot study

 

 

Yolanda KolisaI, II; Olalekan Ayo-YusufI

IDepartment of Community Dentistry, University of Pretoria, South Africa
IIDepartment of Community Dentistry, University of Witwatersrand, South Africa

Correspondence

 

 


ABSTRACT

Seventy to ninety percent of HIV-infected individuals have oral lesions that affect their quality-of-life. Caregivers play an important role in complementing the healthcare team. It is essential that the caregivers have optimal knowledge, beliefs and practices toward the management of care regarding oral-lesions in HIV-infected patients in caregiving institutions in Johannesburg, South Africa. To measure the knowledge, beliefs and practices relating to oral lesions in HIV infection amongst caregivers in caregiving institutions in Johannesburg. This cross-sectional pilot study conducted during 2005 and 2006 involved caregivers in palliative care institutions in Region 8, Johannesburg Metropolitan area (n = 52). Using a questionnaire, information obtained included demographics, knowledge, beliefs and practices with regard to oral care for HIV-positive patients. Principal component analysis was used to extract questionnaire items of the knowledge domain. The knowledge domain displayed excellent internal consistency (Cronbach α-score of > 0.91). Of the caregivers, 65.4% had received training in oral care. Compared to caregivers not trained in oral care (NTOC), those caregivers trained in oral care (TOC) were more likely to be older (31 yrs vs. 44 yrs; p = 0.001), female (72% vs. 94%; p = 0.03) and were less likely to be employed on a full-time basis (94% vs. 68%; p = 0.03). Compared with NTOCs, TOCs had more knowledge regarding HIV-specific lesions and 'routine' oral-care for the patients (p < 0.005). Similarly, TOC caregivers had more positive beliefs about oral care for those living with HIV (p < 0.05). Offering training in oral healthcare to caregivers improves their knowledge of oral lesions and their beliefs about oral care.


OPSOMMING

Sewentig tot negentig persent van MIV-geïnfekteerde individue mondelinge letsels wat hul kwaliteit van lewe. Versorgers speel 'n belangrike rol in die aanvulling van die gesondheidsorg span. Dit is noodsaaklik dat die versorgers het 'n beter kennis, oortuigings en praktyke na die bestuur van sorg met betrekking tot mondelinge letsels in MIV-geïnfekteerde pasiënte in die versorgingstaak van instellings in Johannesburg, Suid-Afrika. Om die kennis, oortuigings en praktyke met betrekking tot mondelinge letsels in MIV-infeksie onder versorgers in die versorgingstaak van instellings in Johannesburg te meet. Hierdie deursnee-loodsstudie uitgevoer gedurende 2005 en 2006 betrokke versorgers in palliatiewe sorg instellings in Streek 8, Johannesburg Metropolitaanse gebied (n = 52). Met behulp van 'n vraelys, inligting ingesluit demografie, kennis, oortuigings en praktyke met betrekking tot mondelinge sorg vir MIV-positiewe pasiënte. Principal component analise is gebruik om vraelys items te onttrek van die kennis domein. Die kennis domein vertoon uitstekende interne konsekwentheid (Cronbach α-telling van > 0,91). Van die versorgers, het 65.4% ontvang opleiding in mondelinge sorg. Vergeleke met versorgers wat nie opgelei in mondelinge sorg (NTOC), die versorgers opgelei in mondelinge sorg (TOC), was meer geneig om ouer (31 jaar teen 44 jaar; p = 0.001), vroue (72% teen 94%; p = 0.03) en is minder geneig om te word op 'n voltydse basis (94% teen 68%, p = 0.03) in diens geneem. Vergeleke met NTOCs, TOCs versorgers het meer kennis aangaande MIV-spesifieke letsels en roetine 'mondelinge sorg vir die pasiënte (p < 0,005). TOC versorgers het meer positiewe oortuigings oor mondelinge sorg vir diegene wat met MIV (p < 0.05). Aanbod opleiding in mondelinge gesondheidsorg te versorgers verbeter hul kennis van mondelinge letsels en hulle oortuigings oor mondelinge sorg.


 

 

Introduction

Significance of work

A holistic team approach has been proposed to be a lasting solution for the management of many medical conditions, especially the management of HIV. Studies done throughout the world indicate that oral lesions associated with HIV occur in over half of HIV patients. These oral lesions have physical, social and psychological consequences for the patient and seriously impair the quality of life in affected individuals. There is therefore a need to provide services to alleviate oral health problems and improve patient comfort. In order for the effective management of HIV including oral manifestations of the disease to be realised fully, knowledge and beliefs regarding the oral manifestations of HIV infection by all professional and lay people involved in the care and support of patient is essential. Caregivers in nongovernmental institutions (NGOs) play an important role in complementing the healthcare team and they are pivotal in offering care and support in the management of HIV including the management of oral lesions. For the caregivers to be able to manage the disease in its entirety, they need optimal knowledge of all aspects of HIV, including the oral manifestations associated with the illness. Evaluation of their current knowledge and belief status is thus important.

Problem statement

With the increasing burden of Human Immunodeficiency Virus (HIV) in South Africa (SA) (Human Sciences Research Council 2008), the care and support of HIV patients has already brought about a great need for community-based, home-based and hospice institutions and good practice on the part of the people who staff these institutions.

In the City of Johannesburg, the care of and support for the people infected and affected by HIV and AIDS in 2006 was limited to 30 non-governmental organisations (NGOs) and community-based organisations (CBOs). Community caregivers employed in these NGOs and CBOs are trained in home care and counselling according to national guidelines (Department of Health 2001). Having the appropriate knowledge of oral health and oral diseases related to HIV infection is essential so that caregivers can provide a general as well as an oral healthcare package of services to patients.

Aim of the study

This study was conducted to measure the levels of knowledge of, beliefs about and practices (KBP) relating to oral lesions in HIV infection amongst caregivers who are employed by the NGOs and CBOs in Johannesburg, South Africa.

Literature review

Studies done throughout the world indicate that oral lesions associated with HIV occur in over 50% and up to 80% of HIV patients (Coogan, Greenspan & Challacombe 2005:705; Lim et al. 2002:605-606). These oral lesions have serious consequences for patients and impair their oral-health-related quality of life (Malele 2007:41; Yengopal & Naidoo 2008:71). There is, therefore, a need to provide services to alleviate oral problems and improve patient comfort.

A review of studies conducted between 2001 and 2012 demonstrated that professional and lay healthcare workers had little or poor knowledge of HIV infection (Erasmus, Luiters & Brijlal 2005:215; Hentgen et al. 2002:106; Prithiviraj 2012:66). The majority of the studies also focused on infection control policies and the knowledge, attitude and practices amongst all healthcare workers regarding oral lesions in HIV (Gachigo & Naidoo 2001:589; King &

Muzzin 2005). These studies, except the recent study by Prithiviraj (2012), did not examine the levels of knowledge of healthcare workers regarding the oral manifestations of HIV infection and the management of these lesions. From reviewed research databases, there was only one study carried out on non-dental healthcare workers about the knowledge, attitudes and practices regarding oral manifestations of HIV in Lesotho (Prithiviraj 2012), but none had been carried out in South Africa.

Definition of key concepts

'Oral lesions in HIV-positive patients' refers to oral conditions experienced by HIV patients because of the compromised immune response that results from their HIV status. These lesions are classified according to the European Clearinghouse Classification (ECC) and the World Health Organization (WHO) (EC-Clearinghouse & WHO 1993:290)

'A caregiver', for the purposes of this study, is a person from a community (ancillary or auxiliary) who worked at the chosen palliative care institutions and provided comprehensive healthcare and support for people infected and affected by HIV in the NGOs and CBOs. Such caregivers also included nurses.

 

Research method and design

Since 2001, the City of Johannesburg (CoJ) has been planning the development and implementation of programmes related to the prevention, care and support for people infected and affected by HIV (City of Johannesburg HIV/AIDS Programme (2004). At the time of this study in 2005-2006, 18 NGOs and CBOs situated in Region 8 provided various care and support programmes for people living with HIV (Dlamini & Rudolph 2004). Only four of these organisations offered hospice or palliative care and they were thus selected to participate in this study. All 62 caregivers that worked in the hospice and palliative care centres in Region 8 of CoJ were recruited by the researchers to participate in the study. Fifty-two agreed to participate and gave informed consent.

Data collection and measurement tool

Data was anonymously collected on a paper-based questionnaire developed especially for the study. The questionnaire was designed to collect socio-demographic information from the caregivers as well as their KBP with regard to oral manifestations of HIV. Socio-demographic information collected included age, gender, marital status, level of education and employment status. The participants were categorised as ever married (separated, divorced, widowed or currently married) or never married. The participants were also categorised as being in full-time employment with the NGO or CBO or not (students, part-time caregivers or volunteers). The questionnaire also obtained information on the participants' practical experience as caregivers and, lastly, on their training in general home-based care and/or oral healthcare.

The questions tested knowledge of common oral manifestations associated with HIV as classified by the ECC and the WHO (EC-Clearinghouse & WHO 1993). Definitions of the oral lesions were described in common language in the questionnaire; for example, 'Can you identify oral thrush [Candidiasis]?' Caregivers were not trained on oral healthcare by the researcher prior to the study. The research aimed to ascertain the KBP of the caregivers with regard to oral care at that point in time.

The questionnaire comprised eight questions related to knowledge, six questions on beliefs and attitudes and extra questions on the socio-demographic characteristics of the respondents' data. Beliefs in this context were based on the theoretical construct that represented an individual's preference or dislike for an item or idea (Jong 1993). Beliefs are subjective and one can have a belief about an event or behaviour (Jong 1993). Questions on belief were based on the literature review on HIV, oral health and related risks from various literature reviewed (Erasmus et al. 2005; Hentgen et al. 2002; King & Muzzin 2005; Marmy & Matt 2003; Rudolph 1999; Thean, Wong & Koh 2007).

It took each participant approximately 15 to 20 minutes to complete the questionnaire. The questionnaire was piloted at an NGO that was not involved in the main study. This was done in order to test for reliability, validity, comprehensibility, time taken to complete, feasibility and the degree to which the questions were interpreted and understood by different individuals.

During questionnaire testing, the respondents indicated that they did not understand the terminology in the questionnaire as stipulated in ECC classification regarding oral lesions in HIV (EC-Clearinghouse & WHO 1993). Simple everyday language was then used to describe the lesions; for example, terms like candidiasis were amended to 'oral thrush' in the final questionnaire. After obtaining informed consent and appropriate ethical approval, the questionnaires were administered and completed while the investigator observed. Caregivers were allowed to ask for clarity on questions. Communication between caregivers was discouraged because it was important to obtain the KBP of each caregiver.

Data analysis

Stata 10 (StataCorp 2007) and SPSS version 19 (IBM Corp. 2010) statistical software were used for the analysis of data. Demographic information was described with means, standard deviations and frequencies. The reliability of the scales derived was assessed using Cronbach's α-score. T-tests for independent samples were used to compare group differences, with interval data for statistical significance, whilst chi-square tests were used to compare group differences between categorical variables. To reduce the number of knowledge variables and to determine the patterns of knowledge, principal component analysis with varimax rotation was performed for questions concerning the knowledge of the caregivers. Factors were extracted using an Eigen value of > 1 as the cut-off point. A p-value of < 0.05 was considered to be statistically significant.

 

Ethical considerations

Approval for this study was obtained from the Human Research Ethics Committee (Medical) of the University of the Witwatersrand, Johannesburg, and clearance certificate number M050504 was provided. The approval from the university was conditional to the approval of the managers at the institutions. The managers of the institutions gave approval for the caregivers working at the institutions to be recruited and if the caregivers consented, they were to be included in the study. Participants who gave informed consent during recruitment were included in the study and completed the questionnaire.

 

Results

A response rate of 84% (52/62) was achieved. Of the caregivers, 65.4% had been trained in oral healthcare and the caregivers were subsequently divided into two categories -those trained in oral healthcare (TOC) and those who had not received training in oral healthcare (NTOC).

The TOC caregivers were significantly older than the NTOC caregivers (p = 0.001). TOCs were also more likely to be females (94.1% vs. 72%; p = 0.03), had been married (58.8% vs. 27.8%; p = 0.03) and most were not employed on a full-time basis (p = 0.03) as compared with NTOCs. The majority of all the caregivers had an education level of Grade 12 and below and level of education was not associated with exposure to training in oral healthcare (Table 1). Nearly 66% of NTOC caregivers were trained in general home-based care (11% of all caregivers) - a basic requirement for the staff of care-giving institutions, as opposed to 100% of TOCs (p = 0.001).

 

 

Following principal component analysis, two knowledge factors were revealed; these were called 'knowledge of specific lesions' and 'knowledge of oral care', explaining 40.4% and 34.3% of the common variance respectively (Table 2).

The TOC caregivers had higher mean scores on 'knowledge' variables in total and on the knowledge subdomains as compared with the NTOCs. The knowledge domain combined displayed an excellent internal consistency (Cronbach α-score > 0.91). (See Table 3.)

 

 

An explorative factor analysis for caregivers' beliefs resulted in a single factor. The TOCs had higher belief frequency scores than the NTOCs. All the caregivers agreed that 'oral care is very important in HIV-positive patients' and that learning more about the mouth care of HIV-positive patients was important (Figure 1). The caregivers differed significantly in their responses and opinions regarding mouth care. In general, the majority of NTOCs reported negative beliefs (p < 0.05).

The majority of NTOC caregivers were concerned about the risk of infection from treating HIV-infected patients as compared with the TOC caregivers (78% vs. 15%; p < 0.05) (Figure 1), as shown in their responses to the statement 'Cleaning the mouth increases the risk of HIV infection for caregivers'.

The caregivers trained in general home-based care had higher scores on the knowledge of 'oral care' but there was no difference in scores regarding knowledge of 'specific lesions' in HIV infection (Table 4).

 

 

The higher the education level, the higher the scores on both knowledge subdomains when those caregivers with higher than Grade 12 were compared with those with or below Grade 12. There was no difference in the 'belief' scores between those with higher and lower education levels (Table 5).

The nature of employment, whether full time or not, did not affect the 'knowledge' scores, as there was no significant difference. The nature of employment, however, influenced both 'belief' and 'self-reported practice' scores. Those not working full time had higher scores compared with those working on a full-time basis (p < 0.05). The higher the score, the more positive the 'beliefs'. Those not working full-time also reported more involvement in tending to the mouth infections of the HIV patients (p < 0.05).

There was a difference in the 'knowledge' scores categorised by marital status (p < 0.05). Those who were 'ever married' (i.e. they were once married or still married) had higher knowledge scores. However, there was no difference in the belief and practice scores in this group.

The 'practices' variable measured the self-reported extent of involvement regarding specific symptoms. The self-reported extent of involvement by NTOC caregivers was higher than that reported by the TOCs (p < 0.05). In particular, the involvement in addressing symptoms not specific to HIV-associated oral lesions (e.g. toothache and gingivitis) was significantly higher amongst the NTOCs (p = 0.05).

All the caregivers were required to respond to questions regarding action regarding and management of specific common oral symptoms. The NTOC caregivers reported providing 'inappropriate management' for some oral symptoms as illustrated (Evian 2003). For example, the NTOCs were less likely to refer patients with bleeding gums to professionals. They were also less likely to provide advice on oral hygiene and were the only ones who reported that they would recommend acyclovir cream following complaints of bleeding gums (Table 6).

 

 

Validity and Reliability

The study findings reflect the actual reported experiences of the caregivers. Statistical quantitative analysis and rigour was applied in order to bring out the significance of the result.

Reliability

The results of the study can be declared reliable because the research tool had good internal consistency after applying the Cronbach α-test.

Validity

The study truthfully and correctly reflects the self-reported levels of KBP of the caregivers. The research was aimed at ascertaining the KBP of the caregivers at that point in time of the study. A thorough data collection process and rigorous analysis produced the current findings to generate a hypothesis around the theme topic, notwithstanding the mentioned limitations.

 

Discussion

The current study determined the knowledge, beliefs and self-reported practices of non-dental healthcare workers in relation to the oral manifestations of HIV using a new questionnaire. The study showed that most of the caregivers had been trained in oral healthcare and that the training was associated with their KBP relating to care for HIV oral lesions.

It was not surprising from the results that most caregivers were female: this fact was in alignment with the gender of most primary caregivers (Neal, Ingersoll-Dayton & Starrels 1997:815).

The national guidelines require that all caregivers should be trained before engagement in comprehensive care and support for people living with HIV. Of concern was that 33% of NTOC caregivers, which is 11% of all caregivers in this study, had not received training in general home-based care.

Factor analysis for the caregivers' knowledge revealed factors in line with general oral healthcare such as tooth-brushing instructions and mouth rinsing. Knowledge of specific lesions seemed to be according to the ECC classification of common oral lesions in HIV infection (EC-Clearinghouse & WHO 1993:290). NTOC caregivers were more likely not to have knowledge of specific lesions associated with HIV infection and knowledge pertaining to oral care for common oral lesions as compared with the TOC caregivers (p < 0.005). The better knowledge reported in the current study is in agreement with the 2004 study by Mynors-Wallis & Davis (2004:202), where a dental talk to a group of old-age home nursing staff produced a significant increase in the level of oral healthcare knowledge and hence in the oral healthcare of patients (Mynors-Wallis & Davis 2004:202). Results from this study are also similar to findings in a study by Frenkel, Harvey and Needs (2002), where an oral healthcare education programme resulted in improved oral healthcare knowledge and attitudes amongst the nursing home caregivers (Frenkel et al. 2002:99). In Frenkel et al.'s study, as well as in the current study, knowledge was affected in a positive manner when caregivers had a higher education level but was not affected by the caregivers' working experience.

The caregivers' beliefs were affected by the nature of their employment, whether full time or not. The caregivers who were not in full-time employment had more positive beliefs than those who worked full time. This could be explained by the fact they did not have to be in constant contact with sick patients and dreaded going to work less than those caregivers who were employed full time in caring for the mouth infections of the HIV-positive patients. Caregiving often results in chronic stress, which has a negative impact on caregivers' psychological health. Depression and negative mental states are common effects of caregiving (Schullz & Sherwood 2008:23). This may suggest the need for regular debriefing for those in full-time employment in order to alleviate the potential of psychological fatigue resulting from regular contact with those suffering from debilitating diseases.

Negative attitudes and beliefs are usually associated with little or no knowledge about a particular topic. Necessary support (training) and knowledge are important with regard to changing beliefs and supporting the positive attitudes of the trained caregivers (Jong 1993). For instance, in a randomised controlled trial on nursing home caregivers, a training intervention significantly improved the knowledge and belief scores in the intervention group (Frenkel et al. 2002:99). Thean et al. (2007) reported, in a pilot study to assess the oral health knowledge amongst staff in a nursing home, that nearly all (99.6%) of the respondents felt that the oral healthcare of the elderly was very important. In the current study, the caregivers who reported being trained in oral care in addition to being trained in general home-based care had more positive beliefs regarding caring for the mouths of HIV-infected patients. Being 'trained in oral healthcare' and 'general home-based care' appears to have created positive attitudes toward caring for the mouth infections of the HIV-positive patients and might conceivably have influenced their beliefs

In the current study, the belief surrounding 'cleaning the mouth' included concern about the risk of infection. The NTOC caregivers had negative beliefs about infection risk and this was of concern because their beliefs might result in compromised care for their HIV-positive patients.

The findings are similar to findings of negative perceptions and beliefs as shown in numerous KBP surveys where the majority of health workers feared becoming infected when attending to HIV-positive patients (Erasmus et al. 2005:216; King & Muzzin 2005).

Taking into consideration the inherent limitation of self-reporting and the fact that it could lead to the Hawthorne effect, the self-reported practices or nature and extent of involvement in addressing presenting symptoms was unexpected. The TOC caregivers reported less involvement with the reported patients' complaints than the NTOCs. In addition, those who had been trained in general home-based care reported more involvement than those who were not trained in general home-based care. The level of education did not alter the self-reported nature of involvement or practices of the caregivers.

This reporting is of concern if the untrained caregivers report actually taking action or giving advice to the patients, because it could imply that the information and/or action is inappropriate or not within standard procedures. Caregivers are meant to support the patients and assist with symptom management. It is preferable for the caregivers to refer management of unfamiliar complaints for professional management. Indeed, it would appear that this was the case, as further analysis of reported advice given to patients by NTOCs appeared inappropriate (Evian 2003). For instance, NTOC caregivers reported being less likely to refer patients with bleeding gums - which could be a symptom of serious ailment - to professionals. The NTOCs also reported being less likely to provide advice on oral hygiene and were the only ones who reported they would recommend acyclovir cream and no fizzy drinks following complaints of bleeding gums.

 

Limitations of the study

A new questionnaire was developed and used for data collection. Although this questionnaire was used for the first time, it was piloted for reliability and validity and found to have good internal consistency and can therefore be used to assess the caregivers' knowledge. Factor analysis revealed items that correlated with the current body of knowledge regarding 'routine oral healthcare' and 'specific lesions'.

This was a cross-sectional study based on self-reporting and was, therefore, subject to reporting bias. Furthermore, only limited inferences can be made on causality. Cross-sectional studies are performed at one point in time, which makes two different and distinct variables that have to be measured at the same time. This factor doesn't allow for establishing the sequence of events, including those which might have occurred concurrently. Therefore, only associations between variables can be concluded but not whether one variable causes the other.

The sample was limited to the whole population of 52 respondents; however, the study was only a pilot survey. This small number made it impossible to adjust for potential confounders. Although this was a small study, it generated a hypothesis on the possible knowledge trends and in this way becomes a basis for further research. The study thus remains a useful baseline for larger well-controlled follow-up studies.

 

Clinical significance

Despite these limitations, the findings of this study provide useful information that can inform interventions to improve HIV patients' access to quality, cost-effective oral healthcare. Caregivers' institutions can be evaluated and caregivers' knowledge can be assessed using tools such as the questionnaire used in this study to get feedback regarding the practice of the caregivers. The questionnaire will provide a quick snapshot of the current practice. Following evaluation, proper corrective measures such as capacity building can be instituted, should the need arise.

 

Recommendations

Bearing in mind the limitations of 'knowledge, beliefs and practices' surveys and the cross-sectional design of the study, the following recommendations are made:

The measurement tool has been validated for this population. It is therefore recommended that a larger sample with different demographics be used to validate the tool. A larger study should be extended to other regions or provinces so that associations and correlations between various variables can be probed. It is further recommended that a larger study look at the gaps between participants' actual and perceived knowledge.

 Training in basic home-based care should be a prerequisite before any caregivers are allowed to interact with patients in order to provide proper supportive care.

 Training in oral healthcare and refresher courses for those trained must be incorporated into the programme of all caregivers working in palliative institutions. Such training would provide specialised knowledge about oral health and oral lesions in HIV infection and thus improve caregivers' current knowledge, attitudes and practices, including making appropriate referrals or professional management of HIV-specific lesions.

 Training workshops should be initiated in all the NGOs and CBOs providing palliative care and support, as well as in other institutions, in order not to further disadvantage the users of these facilities.

 

Conclusion

The study findings suggest that the caregivers' knowledge levels with regard to caring for oral lesions in HIV infection were better amongst those caregivers who reported receiving prior training, specifically in oral healthcare (TOC). The caregivers' knowledge was also associated with training in general home-based care, marital status and their education level. The caregivers who reported being also trained in general home-based care in addition to being TOC had higher knowledge levels on 'oral care'. The higher the education level of caregivers, the higher the knowledge levels on both 'specific lesion in HIV' and on routine 'oral care'.

The findings also demonstrate that the caregiver's beliefs about oral care for HIV lesions were better in caregivers who reported prior TOC. The TOC caregivers were more positive toward caring for patients with oral lesions in HIV and the risk related to HIV infection. However, all caregivers acknowledged that oral care is important for HIV patients and that learning more about mouth care in HIV infection is essential. Beliefs were also influenced by work type (i.e. whether working full time or not). Those working part time seemed to feel more positive as compared to those employed full time.

With regards practices (nature and/or extent of involvement) of caregivers regarding care for oral lesions in HIV patients, those who reported to have received previous TOC reported having provided appropriate care as stipulated by the guidelines. In addition, the TOCs seemed more likely to be cautious in providing care for the patients and rather referred patients for professional management of oral lesions when not sure. This study's findings highlight the importance of training caregivers as part of efforts to improve the standard of care to those living with HIV.

 

Acknowledgements

I would like to acknowledge Prof. M.J. Rudolph and Dr V. Yengopal for their involvement and advice with the project. I remain very grateful to the caregivers interviewed in the study for their contributions.

Competing interests

The authors declare that they have no financial or personal relationship(s) which may have inappropriately influenced them in writing this article.

Authors' contributions

Y.K. (University of Pretoria) was the project leader and responsible for most of the project design, data collection and wrote the manuscript. O.A.A-Y. (University of Pretoria) performed all the statistical analysis and made conceptual contributions regarding the content of the manuscript.

 

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Correspondence:
Yolanda Kolisa
PO Box 1266
Pretoria 0001, South Africa
Email: yolanda.kolisa@up.ac.za

Received: 02 Oct. 2012
Accepted: 28 Mar. 2013
Published: 10 Sept. 2013

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