1. International Centre for Reproductive Health (ICRH) Department of Public Health and Primary Care Faculty of Medicine and Health Sciences Ghent University Ghent Belgium
2. The Research Center for Public Health Tsinghua University Beijing China
3. Department of Experimental Clinical and Health Psychology Faculty of Psychology and Educational Sciences Ghent University Ghent Belgium
4. Section of Geriatrics Department of Internal Medicine and Paediatrics Ghent University Ghent Belgium
5. Department of Sociology School of Social Sciences Tsinghua University Beijing China
6. School of Public Health Université libre de Bruxelles (ULB) Bruxelles Belgium