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a–d Forest Plots of Reported Retention at 6, 12, 24 and 36 Months after Initiation of Antiretroviral Therapy in Sub-Saharan Africa*. *Pooled estimates were created using random-effects meta-analysis. Data include both actual reported rates for studies that reported to each time point and linear interpolation for studies which reported to a later time point but not the current time point.
