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Johnson, Leigh F; Estill, Janne; Keiser, Olivia; Cornell, Morna; Moolla, Haroon; Schomaker, Michael; Grimsrud, Anna; Davies, Mary-Ann; Boulle, Andrew (2014). Do Increasing Rates of Loss to Follow-up in Antiretroviral Treatment Programs Imply Deteriorating Patient Retention? American journal of epidemiology, 180(12), pp. 1208-12. Oxford University Press 10.1093/aje/kwu295