1 Department of Obstetrics and Gynecology, Herlev and Gentofte University Hospital, Borgmester Ib Juuls Vej 1, 2730 Herlev, Copenhagen, Denmark; Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. Electronic address: [email protected].
2 Center for Clinical Epidemiology, Odense University Hospital, Odense, Denmark; Research Unit of Clinical Epidemiology, Department of Clinical Research, University of Southern Denmark, Odense, Denmark.
3 Department of Obstetrics and Gynecology, Herlev and Gentofte University Hospital, Copenhagen, Denmark; Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.