1. Department of General Practice, Turku University and Turku University Hospital, Turku, Finland
2. Central Satakunta Health Federation of Municipalities, Harjavalta, Finland
3. Folkhälsan Research Center, Helsinki, Finland
4. Department of General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
5. Department of Obstetrics and Gynecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
6. Agency for Science, Technology and Research (A*STAR), Singapore Institute for Clinical Sciences (SICS), Singapore, Singapore
7. Unit of Primary Health Care, Kuopio University Hospital, Kuopio, Finland