1. SAMRC/WITS Centre for Health Economics and Decision Science - PRICELESS SA, School of Public Health, Faculty of Health Science, University of the Witwatersrand, Johannesburg, South Africa
2. School of Statistics and Actuarial Science, University of the Witwatersrand, Johannesburg, South Africa
3. MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
4. Department of Epidemiology and Global Health, Umeå University, Umeå, Sweden