1. Department of Obstetrics and Gynecology, Freiburg University Medical Center, Freiburg, Germany; Department of Obstetrics and Gynecology, Ulm University Medical Center, Ulm, Germany; and Department of Obstetrics and Gynecology, University Medical Center Maastricht, Maastricht, The Netherlands; Department of Obstetrics and Gynecology, Freiburg University Medical Center, Hugstetter Strasse 55, D-79106, Freiburg/Brsg, Germany;
2. Department of Obstetrics and Gynecology, Freiburg University Medical Center, Freiburg, Germany; Department of Obstetrics and Gynecology, Ulm University Medical Center, Ulm, Germany; and Department of Obstetrics and Gynecology, University Medical Center Maastricht, Maastricht, The Netherlands