University of Cape Town (UCT) - Desmond Tutu HIV Centre, University of Cape Town (UCT) - Desmond Tutu HIV Centre, Queen Mary University of London - Wolfson Institute of Population Health, University of Cape Town (UCT) - Desmond Tutu HIV Centre, Queen Mary University of London - Blizard Institute, University of Cape Town (UCT) - Wellcome Centre for Infectious Diseases Research in Africa, Red Cross War Memorial Children’s Hospital - Paediatric Infectious Diseases Unit, University of East Anglia (UEA) - Norwich Medical School, University of East Anglia (UEA) - Faculty of Medicine and Health, Queen Mary University of London - Wolfson Institute of Population Health, University of Delhi - Institute of Eminence, London School of Hygiene & Tropical Medicine, Queen Mary University of London - Wolfson Institute of Population Health, University of Cape Town (UCT) - Wellcome Centre for Infectious Disease Research in Africa, Institute of Infectious Disease and Molecular Medicine, University of Cape Town (UCT) - Desmond Tutu HIV Centre and Queen Mary University of London - Barts and The London School of Medicine and Dentistry