1. Department of Obstetrics, Juliane Marie Centre; Copenhagen University Hospital Rigshospitalet; Copenhagen Denmark
2. Centre for Clinical Education; Copenhagen University Hospital Rigshospitalet; Copenhagen Denmark
3. Department of Obstetrics and Gynaecology; St. Olavs University Hospital; Trondheim Norway
4. Department of Obstetrics and Gynaecology; Skåne University Hospital; Malmö Sweden
5. Department of Anesthesia and The Wilson Centre; University of Toronto and University Health Network; Toronto ON Canada