1. Health System Research Unit, Medical Research Council of South Africa, Cape Town, South Africa
2. Health Economics Unit, Department of Public Health, University of Cape Town, South Africa
3. Towers Watson, Cape Town, South Africa
4. Centre for Infectious Disease Epidemiology & Research, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa
5. Division of Epidemiology and Biostatistics, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa
6. School of Dentistry, The University of Queensland, Herston, Queensland, Australia