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Flow diagram of study population. HAART - highly active antiretroviral treatment; early HAART was defined as initiation before 28 weeks of pregnancy and late HAART as initiation at ≥28 weeks of pregnancy; PI-based HAART - protease inhibitor-based HAART; EFV-based HAART - efavirenz-based HAART; NVP-based HAART - nevirapine-based HAART.
