[1] Botswana UPenn Partnership, Gaborone, Botswana
[2] Botswana Harvard AIDS Inst Partnership, Private Bag BO 320, Gaborone, Botswana
[3] Botswana Minist Hlth & Wellness, Gaborone, Botswana
[4] Univ Penn, Perelman Sch Med, Dept Obstet & Gynecol, Philadelphia, PA 19104 USA
[5] Univ Botswana, Dept Res, Gaborone, Botswana
[6] Univ Botswana, Sch Med, Gaborone, Botswana
[7] Univ Liverpool Liverpool Sch Trop Med, Dept Int Publ Hlth, Liverpool, Merseyside, England
[8] Univ Cape Town, Sch Publ Hlth & Family Med, Womens Hlth Res Unit, Cape Town, South Africa