1. School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa;
2. Department of Social Anthropology and Ethnography, University of Bordeaux 2, Bordeaux, France
3. Ecole des Hautes Études en Sciences Sociales, Paris, France
4. Centre for Health Policy, University of Witwatersrand, Johannesburg, South Africa
5. Institut de Recherche Interdisciplinaire sur les Enjeux Sociaux, EHESS, Paris