1. Department of Obstetrics and Gynecology; Oulu University Hospital and University of Oulu; Oulu Finland
2. Department of Anesthesiology; Oulu University Hospital; Oulu Finland
3. Department of Obstetrics and Gynecology; Satakunta Central Hospital; Pori Finland
4. Department of Surgery; Oulu University Hospital; Oulu Finland
5. Laboratory Animal Centre; Experimental Surgery; Oulu University Hospital and University of Oulu; Oulu Finland
6. Division of Maternal Fetal Medicine; Department of Obstetrics and Gynecology; Oregon Health & Science University; Portland OR USA
7. Women's Health and Perinatology Research Group; Department of Clinical Medicine; Faculty of Health Science; University of Norway and University Hospital of Northern Norway; Tromsø Norway
8. Department of Clinical Science; Intervention and Technology; Karolinska Institute; Stockholm Sweden
9. Department of Obstetrics and Gynecology; Helsinki University Hospital and University of Helsinki; Helsinki Finland