1. Department of Obstetrics and Gynaecology Nykøbing Falster Hospital Nykøbing Falster Denmark
2. Department of Obstetrics and Gynaecology Rigshospitalet Copenhagen University Hospital Copenhagen Denmark
3. Juliane Marie Centre Rigshospitalet Copenhagen University Hospital Copenhagen Denmark
4. Copenhagen Trial Unit Centre for Clinical Intervention Research Rigshospitalet Copenhagen University Hospital Copenhagen Denmark