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Influence of CYP2B6 c.516G→T and CYP2B6 c.983T→C polymorphisms (A) and of CYP2A6*9 and CYP2A6*17 polymorphisms (B) on efavirenz mid-dose concentrations (average of 4-week and 8-week samples) in human immunodeficiency virus (HIV) and HIV/tuberculosis co-infected patients in Ghana. Differences between groups were examined by Mann–Whitney rank sum test (two genotype groups) or by anova (three genotype groups) with post hoc Student–Newman–Keuls pair-wise multiple comparisons testing
