Njuguna IN, Beima-Sofie K, Mburu CW, Mugo C, Neary J, Itindi J, Onyango A, Richardson BA, Rubin Means A, Sharma M, Weiner BJ, Wagner AD, Oyiengo L, Wamalwa D, John-Stewart G. Adolescent transition to adult care for HIV-infected adolescents in Kenya (ATTAC