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Time to (a) viral load suppression below 400 copies/ml by 12 months and (b) virological failure during study follow-up. ART, antiretroviral therapy; EFV, efavirenz; NRTI, nucleoside reverse transcriptase inhibitor; NNRTI, non-nucleoside reverse transcriptase inhibitor; NVP, nevirapine; PI, protease inhibitor.
