1. From the Department of Obstetrics and Gynaecology (A.C.S.), Oslo University Hospital, Ullevål, Norway; Faculty of Medicine (A.C.S.), University of Oslo, Oslo, Norway; HELIOS Klinikum Berlin (R.D.), Franz-Volhard Clinic, Berlin, Germany; Experimental and Clinical Research Center (R.D.), Max-Delbrück-Center for Molecular Medicine, Berlin, Germany; Department of Obstetrics and Gynaecology (R.P.), University Hospital Gasthuisberg, Katholieke Universiteit, Leuven, Belgium.