1. Norwegian National Advisory Unit for Women's Health; Oslo University Hospital; Oslo Norway
2. Institute of Clinical Medicine; University of Oslo; Oslo Norway
3. Nordsjaellands Hospital; Hillerød Denmark
4. Department of Obstetrics; Oslo University Hospital Rikshospitalet; Oslo Norway
5. Department of Obstetrics; Karolinska University Hospital; Stockholm Sweden
6. National Institute for Health and Welfare Finland; Helsinki Finland
7. Department of Neurobiology, Care Sciences and Society; Division of Family Medicine; Karolinska Institute; Stockholm Sweden
8. Landspitali University Hospital/University of Iceland; Reykjavik Iceland