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

London School of Hygiene & Tropical Medicine - Department of Clinical Research, Biomedical Research and Training Institute, Biomedical Research & Training Institute - The Health Research Unit Zimbabwe, University Teaching Hospital, Lusaka, London School of Hygiene & Tropical Medicine, London School of Hygiene & Tropical Medicine - Department of Clinical Research, University Teaching Hospital, Lusaka, Biomedical Research and Training Institute, Department of Paediatrics, University of Zimbabwe, Biomedical Research & Training Institute - The Health Research Unit Zimbabwe, University of Oxford - Nuffield Department of Medicine, affiliation not provided to SSRN, London School of Hygiene & Tropical Medicine - MRC Tropical Epidemiology Group (TEG), University of East Anglia (UEA) - Norwich Medical School, University Teaching Hospital, Lusaka and University of Bristol - Musculoskeletal Research Unit

University of Cape Town (UCT) - Desmond Tutu HIV Centre, University of the Witwatersrand - School of Clinical Medicine, Queen Mary University of London - Wolfson Institute of Population Health, University of Cape Town (UCT) - Desmond Tutu HIV Centre, University of Cape Town (UCT) - Desmond Tutu HIV Centre, Queen Mary University of London - Blizard Institute, University of Cape Town (UCT) - Health through Physical Activity, Lifestyle and Sport Research Centre (HPALS), University of Cape Town (UCT) - Wellcome Centre for Infectious Diseases Research in Africa, South African Medical Research Council - Biostatistics Unit, 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, University of Southampton - Medical Research Council Life Course Epidemiology Unit, University of Southampton - Medical Research Council Life Course Epidemiology Unit, 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