1. Faculty of Medicine and Health Sciences, Division of Human Nutrition, Stellenbosch University, Cape Town, South Africa
2. Department of Statistics and Actuarial Sciences, Stellenbosch University, Tygerberg, South Africa
3. South African Medical Research Council, Burden of Disease Research Unit, Cape Town, South Africa
4. Faculty of Medicine and Health Sciences, Department of Paediatrics and Child Health, Stellenbosch University, Cape Town, South Africa