1. Department of Obstetrics and Gynaecology; Odense University Hospital; Odense Denmark
2. Department of Obstetrics and Gynaecology; Turku University Hospital; Turku Finland
3. Department of Obstetrics and Gynaecology; Lidköping Hospital; Lidköping Sweden
4. Department of Obstetrics and Gynaecology; Ahus University Hospital; Ahus Norway
5. Centre for Primary Healthcare Research; Faculty of Medicine; University of Lund; Lund Sweden
6. Department of Obstetrics and Gynaecology; Skane University Hospital; University of Lund; Lund Sweden