Pregnancies among women living with HIV using contraceptives and antiretroviral therapy in western Kenya: a retrospective, cohort study oleh Rena C. Patel, Gustavo Amorim, Beatrice Jakait, Bryan E. Shepherd, A. Rain Mocello, Beverly Musick, Caitlin Bernard, Maricianah Onono, Elizabeth A. Bukusi, Kara Wools-Kaloustian, Craig R. Cohen, Constantin T. Yiannoutsos, on behalf of the Implant/Efavirenz Study Group and the East Africa IeDEA Regional Consortium