University College London - MRC Clinical Trials Unit, University College London - MRC Clinical Trials Unit, Baylor University - Children's Foundation Uganda, University of Zimbabwe - Clinical Trials Research Centre, Joint Clinical Research Centre, Chris Hani Baragwanath Academic Hospital, Makerere University - Johns Hopkins University Research Collaboration, University of the Witwatersrand - Perinatal HIV Research Unit, Khon Kaen University - Khon Kaen Hospital, University of KwaZulu-Natal - Department of Paediatrics and Children Health, Chulalongkorn University - Center of Excellence in Pediatric Infectious Diseases and Vaccines, University of Hamburg - University Medical Center Hamburg-Eppendorf, Institut de Recerca Sant Joan de Deu - Infectious Diseases Department, Khon Kaen University - Khon Kaen Hospital, Baylor University - Children's Foundation Uganda, Mahasarakam Hospital, NSERM/ANRS SC10-US19, Essais Thérapeutiques et Maladies Infectieuses, Joint Clinical Research Centre, Mbarara, University of Zimbabwe - Clinical Trials Research Centre, University College London - Infection, Immunity and Inflammation Research & Teaching Department, Department of Paediatrics, University of Zimbabwe, Joint Clinical Research Centre, Stellenbosch University - Children’s Infectious Diseases Clinical Research Unit (KID-CRU), London School of Hygiene & Tropical Medicine - Department of Clinical Research, University of Padua - Department of Women’s and Children’s Health, Instituto de Investigación 12 de Octubre (imas12) - Pediatric Infectious Diseases Unit, University of the Witwatersrand - Perinatal HIV Research Unit, University College London - MRC Clinical Trials Unit, University College London - MRC Clinical Trials Unit and Independent