1. Division of Clinical Epidemiology, Department of Medicine Solna, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
2. Theme Women’s Health, Department of Obstetrics, Karolinska University Hospital, Stockholm, Sweden
3. Department of Obstetrics and Gynecology, Visby County Hospital, Visby, Sweden
4. Division of Neonatology, Obstetrics and Gynecology, Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden
5. Department of Gynecology and Reproductive Medicine, Karolinska University Hospital, Stockholm, Sweden