1. Department of Gynecology, Obstetrics and Pediatrics, Nykøbing Falster Hospital , 4800 Nykøbing Falster , Denmark
2. Department of Obstetrics and Gynecology, Herlev Hospital , 2730 Herlev , Denmark
3. Department of Public Health, University of Copenhagen , 1353 Copenhagen K , Denmark
4. Department of Anesthesiology and Intensive Care, Nykøbing Falster Hospital , 4800 Nykøbing Falster , Denmark
5. Center for Pregnant Women with Diabetes, Department of Obstetrics , Rigshospitalet, 2100 Copenhagen Ø , Denmark
6. Department of Clinical Medicine, University of Copenhagen , 2200 Copenhagen N , Denmark
7. Department of Obstetrics and Gynecology, Aalborg University Hospital , 9000 Aalborg , Denmark
8. Department of Clinical Medicine, Aalborg University , 9000 Aalborg , Denmark
9. Center for Epidemiological Research, Nykøbing Falster Hospital, University of Copenhagen , Ejegodvej 63, 4800 Nykøbing Falster , Denmark