1. International Centre for Reproductive Health, Ghent University, Ghent, Belgium
2. Department of Economic and Public Health Evaluation, Haute Autorité de Santé, Saint-Denis La Plaine Cedex, France
3. Department Internal Medicine, Infectious Diseases and Psychosomatic Medicine, Ghent University Hospital, Ghent, Belgium
4. Institute of Public Health, University of Porto Medical School, Porto, Portugal
5. National Institute for Health Development, Tallinn, Estonia
6. National Health and Welfare Institute, Helsinki, Finland