1. Gender and Health Research Unit, South African Medical Research Council, South Africa; School of Public Health and Family Medicine, Faculty of Health Sciences, University of Cape Town, South Africa
2. Gender and Health Research Unit, South African Medical Research Council, South Africa; Biostatistics Unit, South African Medical Research Council, South Africa
3. Gender and Health Research Unit, South African Medical Research Council, South Africa; School of Public Health, University of Witwatersrand, South Africa
4. Gender and Health Research Unit, South African Medical Research Council, South Africa; Office of the Executive Scientist, South African Medical Research Council, South Africa
5. Gender and Health Research Unit, South African Medical Research Council, South Africa
6. Department of Paediatrics and Child Health, Faculty of Health Sciences, University of Cape Town, South Africa