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Probability of survival following enrollment in the Kilombero and Ulanga Antiretroviral Cohort, estimated according to 4 different methods, Ifakara, Tanzania, 2005–2015. Method A, routine data; method B, routine data plus tracing data; method C, Frangakis and Rubin (14) method; method D, extension to the Frangakis and Rubin method. See Methods section of text for more details.
