University of California, Los Angeles (UCLA) - Department of Epidemiology, affiliation not provided to SSRN, University of Colorado, Aurora - Anschutz Medical Campus, University of Cape Town - Division of Clinical Pharmacology, affiliation not provided to SSRN, University of Cape Town (UCT) - Division of Epidemiology & Biostatistics, affiliation not provided to SSRN, University of Cape Town (UCT) - Centre of Infectious Disease Epidemiology and Research (CIDER), University of Cape Town (UCT) - Desmond Tutu HIV Centre, affiliation not provided to SSRN, University of California, Los Angeles (UCLA) - Department of Epidemiology and University of Cape Town (UCT) - Division of Epidemiology & Biostatistics

University of KwaZulu-Natal - Nelson R Mandela School of Medicine, Emory University - Rollins School of Public Health, University of Rochester, Emory University - School of Medicine, University of Kwazulu-Natal, Emory University - Rollins School of Public Health, Emory University - School of Medicine, Emory University - School of Medicine, University of Kwazulu-Natal, University of Kwazulu-Natal, Emory University - Rollins School of Public Health, University of Colorado, Aurora - Anschutz Medical Campus, Harvard University - Harvard Medical School, Harvard University - Brigham and Women's Hospital, University of KwaZulu-Natal - Department of Infectious Diseases and Emory University - Rollins School of Public Health