1. Institute of Sociological Research Department of Sociology University of Geneva Geneva Switzerland
2. Division of Social and Behavioural Sciences School of Public Health & Family Medicine University of Cape Town Cape Town South Africa
3. Swiss Tropical and Public Health Institute (Swiss TPH) Basel Switzerland
4. University of Basel Basel Switzerland
5. Department of Pediatrics Fribourg Cantonal Hospital Fribourg Switzerland
6. University Department of Medicine Kantonsspital Baselland University of Basel Bruderholz Switzerland