1. Department of Medical and Health Sciences, Linköping University, Linköping, Sweden;
2. Department of Obstetrics and Gynaecology, Eksjö Hospital, Jönköping County, Sweden;
3. Jönköping Academy for Improvement of Health and Welfare, Jönköping University, Jönköping, Sweden;
4. Department of Obstetrics and Gynaecology and Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden