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23. Warren R M, van Pittius N C, Barnard M, Hesseling A, Engelke E, de Kock M, Gutierrez M C, Chege G K, Victor T C, Hoal E G, van Helden P D 2006 Differentiation of Mycobacterium tuberculosis complex by PCR amplification of genomic regions of difference. International Journal of Tuberculosis and Lung Disease 10: 818-822