1. Epidemiology and Public Health, Swiss Tropical and Public Health Institute, University of Basel, Basel, Switzerland
2. Epidemiology and Biostatistics, School of Public Health, University of the Witwatersrand, Johannesburg, South Africa
3. School of Public Health, University of the Witwatersrand, Johannesburg, South Africa
4. Right to Care, EQUIP Health, Johannesburg, South Africa