1. South African Medical Research Council; South African Cochrane Centre; PO Box 19070 Tygerberg Western Cape South Africa 7505
2. Stellenbosch University; Centre for Evidence-based Health Care; PO Box 19063 Cape Town Western Cape South Africa 7505 Tygerberg
3. University of Cape Town; Department of Psychiatry and Mental Health, Faculty of Health Sciences; Cape Town South Africa
4. University of California, San Francisco; Department of Epidemiology and Biostatistics; San Francisco California USA
5. Stellenbosch University; Division of Human Nutrition, Faculty of Medicine and Health Sciences; Tygerberg South Africa
6. Eastern Cape Department of Health; Lilitha College of Nursing; Lusikisiki Eastern Cape South Africa
7. Stellenbosch University; Faculty of Medicine and Health Sciences; PO Box 19063 Tygerberg South Africa 7505