1. Department of Gynecology and Obstetrics, University Clinic Schleswig-Holstein, Campus Kiel, Michaelisstrasse 16, 24105 Kiel, Germany.
2. Department of Gynecology and Obstetrics, University Clinic Schleswig-Holstein, Campus Kiel, Michaelisstrasse 16, 24105 Kiel, Germany
3. Department of Gynecology and Obstetrics, University Clinic Marburg, Baldinger Strasse 35043, Marburg, Germany
4. Department of Gynecology and Gynecolical Oncology, Dr. Horst Schmidt Kliniken GmbH, Wiesbaden Germany, Ludwig-Erhard-Strasse 100, 65199 Wiesbaden, Germany
5. Department of Gynecology and Obstetrics, Ubbo-Emmius-Klinik GmbH, Aurich, Germany