1. DSI/NRF Centre of Excellence in Human Development, University of the Witwatersrand, South Africa
2. Department of Work and Social Psychology, Maastricht University, the Netherlands
3. SAMRC/Wits Developmental Pathways for Health Research Unit, Department of Pediatrics and Child Health, School of Clinical Medicine, University of the Witwatersrand, South Africa
4. Human Sciences Research Council, Cape Town, South Africa
5. Department of Health Psychology, Open University, the Netherlands