Renee Heffron, Deborah Donnell, Helen Rees, Connie Celum, Nelly Mugo, Edwin Were, Guy de Bruyn, Edith Nakku-Joloba, Kenneth Ngure, James Kiarie, Robert W Coombs, Jared M Baeten,
Use of hormonal contraceptives and risk of HIV-1 transmission: a prospective cohort study Lancet Infectious Diseases. ,vol. 12, pp. 19- 26 ,(2012) ,
10.1016/S1473-3099(11)70247-X