Affiliation: | a Centre for Infectious Disease Research in Zambia (CIDRZ), Lusaka, Zambia b Department of Obstetrics and Gynecology, University of Alabama at Birmingham School of Medicine, Birmingham, AL c Department of Obstetrics and Gynaecology, University of Zambia School of Medicine, Lusaka, Zambia d Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC e Catholic Medical Mission Board, Lusaka, Zambia f Department of Epidemiology, Vanderbilt School of Medicine, Nashville, TN. |