1. Obstetrics and Gynaecology Department of Clinical and Experimental Medicine Faculty of Health Sciences Linköping University Linköping Sweden
2. Department of Gynaecology and Obstetrics in Linköping County Council of Östergötland Linköping Sweden
3. Division of Obstetrics and Gynaecology Department of Clinical Sciences Karolinska Institutet Danderyd Hospital Stockholm Sweden