Department of Social Policy and Intervention, University of Oxford, Oxford, UK; Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa. Electronic address: lucie.cluver@spi.ox.ac.uk.Institute of Global Health, University College London, London, UK.Department of Social Policy and Intervention, University of Oxford, Oxford, UK; Centre for Social Science Research, University of Cape Town, Cape Town, South Africa.Centre for Social Science Research, University of Cape Town, Cape Town, South Africa; School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.HIV Center for Clinical and Behavioral Studies, Department of Psychiatry, New York State Psychiatric Institute, New York, NY, USA; Columbia University Irving Medical Center, New York, NY, USA.Department of Psychiatry, College of Medicine, University of Ibadan, Ibadan, Nigeria.Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA.Agency for Research and Development Initiative, Juba, South Sudan.Highly Vulnerable Children Research Center, Cape Town, South Africa; Tulane University School of Public Health, New Orleans, LA, USA.Global HIV, Hepatitis and Sexually Transmitted Infections Programmes, World Health Organization, Geneva, Switzerland.Centre for Rural Health, University of KwaZulu-Natal, Durban, South Africa.Africaid, Harare, Zimbabwe.Institute for Life Course Health Research, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa.Teen Advisory Group, University of Cape Town, Cape Town, South Africa.Institute for Life Course Health Research, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa; School of Nursing and Midwifery, Queens University, Belfast, UK.Department of Information Systems, University of the Western Cape, Cape Town, South Africa.