1. Health and Demographic Research Unit, Department of Sociology, Ghent University, Ghent 9000, Belgium
2. Department of Political Science, Stellenbosch University, Stellenbosch 7600, South Africa
3. Centre for Health Systems Research & Development, University of the Free State Main Campus, Steyn Annex Building 309, Nelson Mandela Road, Bloemfontein 9300, South Africa
4. Centre for Rural Health, School of Nursing & Public Health, Howard College Campus, University of KwaZulu-Natal, Durban 4041, South Africa
5. Centre for Longitudinal and Life Course Studies, Department of Sociology, University of Antwerp 2000, Belgium
6. Faculty of Arts and Social Sciences & Department of Political Science, Stellenbosch University, Stellenbosch 7600, South Africa