1. Center for Clinical Research and Prevention, Bispebjerg-Frederiksberg Hospital, Nordre Fasanvej 57, 2000 Frederiksberg, Denmark
2. Department of Gynecology and Obstetrics, Slagelse Hospital, Fælledvej 14, 4200 Slagelse, Denmark
3. Department of Gynecology and Obstetrics, Copenhagen University Hospital—North Zealand, Dyrehavevej 29, 3400 Hillerød, Denmark
4. Center for Early Intervention and Family Research, Department of Psychology, University of Copenhagen, Øster Farimagsgade 2A, 1353 Copenhagen, Denmark
5. Department of Midwifery and Therapeutic Science, University College Copenhagen, Sigurdsgade 26, 2200 Copenhagen, Denmark