Retention in care and connection to care among HIV-infected patients on antiretroviral therapy in Africa: estimation via a sampling-based approach. oleh Elvin H Geng, David V Glidden, Mwebesa Bosco Bwana, Nicolas Musinguzi, Nneka Emenyonu, Winnie Muyindike, Katerina A Christopoulos, Torsten B Neilands, Constantin T Yiannoutsos, Steven G Deeks, David R Bangsberg, Jeffrey N Martin