1. Centre for Global Surgery, Department of Global Health Stellenbosch University Tygerberg South Africa
2. Department of Surgery Worcester Regional Hospital Worcester South Africa
3. Ukwanda Centre for Rural Health, Stellenbosch University Tygerberg South Africa
4. Alcohol Tobacco and Other Drug Research Unit South African Medical Research Council Pretoria South Africa
5. Biostatistics Unit, South African Medical Research Council Tygerberg South Africa
6. Division of Epidemiology and Biostatistics, Department of Global Health Stellenbosch University Tygerberg South Africa
7. Department of Psychiatry Stellenbosch University Tygerberg South Africa