1. Department of Obstetrics and Gynaecology; University of Tartu; Tartu Estonia
2. Doctoral School of Clinical Medicine; University of Tartu; Tartu University Hospital; Tartu Estonia
3. Department of Population, Family and Reproductive Health; Johns Hopkins Bloomberg School of Public Health; Baltimore MD USA
4. Gender, Sexual and Reproductive Health; CESP Center for Research in Epidemiology and Population Health; Kremlin Bicêtre France
5. National Institute for Health; Rome Italy
6. National Institute for Health and Welfare; Helsinki Finland
7. Nordic School of Public Health; Gothenburg Sweden
8. Institute for Hygiene and Tropical Medicine; New University of Lisbon; Lisbon Portugal