1. SAMRC/Wits Developmental Pathways for Health Research Unit, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
2. School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
3. Noncommunicable Diseases Research Division, Wits Health Consortium (PTY) Ltd, Johannesburg, South Africa
4. DSI-NRF Centre of Excellence in Human Development, University of the Witwatersrand, Johannesburg, South Africa
5. Global Health Research Institute, School of Human Development and Health, University of Southampton, Southampton, United Kingdom