1. Obstetrics and Gynecology, University-Hospital, Heidelberg, Germany
2. Technical Hygiene, Charité, Berlin, Germany
3. Institute of Medical Biometry and Informatics, University of Heidelberg, Germany
4. Gynäkologie, DKD-HELIOS-Klinik Wiesbaden, Germany
5. Frauenklinik Nordstadtkrankenhaus, Krankenhaus Region Hannover, Germany
6. Frauenklinik, Universitätsklinik Tübingen, Tübingen, Germany