University of California, Los Angeles (UCLA) - UCLA Center for Clinical AIDS Research and Education, Fred Hutchinson Cancer Research Center - Statistical Center for HIV/AIDS Research and Prevention, University of North Carolina (UNC) at Chapel Hill, Oswaldo Cruz Foundation (FIOCRUZ) - Evandro Chagas National Institute of Infectious Diseases (INI), University of KwaZulu-Natal - Centre for the AIDS Programme of Research in South Africa (CAPRISA), San Francisco Department of Health - Bridge HIV, George Washington University - Department of Epidemiology, University of North Carolina (UNC) at Chapel Hill - UNC-Project Malawi, Chris Hani Baragwanath Academic Hospital - Perinatal HIV Research Unit, Fred Hutchinson Cancer Research Center - Statistical Center for HIV/AIDS Research and Prevention, Fred Hutchinson Cancer Research Center - Statistical Center for HIV/AIDS Research and Prevention, Johns Hopkins University - School of Medicine, Johns Hopkins University - School of Medicine, Johns Hopkins University - Department of Pathology, University of California, Los Angeles (UCLA) - UCLA Center for Clinical AIDS Research and Education, Government of the United States of America - National Institute of Allergy and Infectious Diseases (NIAID), Government of the United States of America - National Institutes of Health (NIH), ViiV Healthcare Ltd., ViiV Healthcare Ltd., University of North Carolina (UNC) at Chapel Hill, FHI 360 and Johns Hopkins University - School of Medicine