1. Department of Obstetrics and Gynecology; Hillerød Hospital, University of Copenhagen; Hillerød
2. Gynecological Clinic, Rigshospitalet; University of Copenhagen; Copenhagen
3. Department of Obstetrics, Rigshospitalet; University of Copenhagen; Copenhagen
4. Department of Anesthesiology; Hillerød Hospital, University of Copenhagen; Hillerød; Denmark