1 Section for Epidemiology and Social Medicine, Department of Public Health, Institute of Medicine-Master in Global Health, The Sahlgrenska Academy at University of Gothenburg, Box 414, SE-405 Gothenburg, Sweden.
2 Postdoctoral Fellow, Centre for Health Systems Research & Development, University of the Free State, Bloemfontein, South Africa.
3 Office of the Dean, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa.
4 School of Health Systems and Public Health, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa.