Experiences with simultaneous use of contraception and the vaginal ring for HIV prevention in sub-Saharan Africa oleh Jonah Leslie, Flavia Kiweewa, Thesla Palanee-Phillips, Katherine Bunge, Felix Mhlanga, Betty Kamira, Jared Baeten, Ariana Katz, Sharon Hillier, Elizabeth Montgomery, for the MTN-020/ASPIRE Study Team