1. Medical Center - University of Freiburg, Department of Obstetrics & Gynecology, Germany

2. St. Josefs-Hospital, Wiesbaden, Germany

3. Kreiskrankenhaus Preetz, Germany

4. Klinikum Tettnang, Germany

5. Klinikum Fulda, Frauenklinik, Germany

6. Krankenhaus Hetzelstift, Neustadt, Germany

7. Evangelisches Krankenhaus, Frauenklinik, Oldenburg, Germany

8. Medical Center - University of Freiburg, Clinical Trials Unit, Germany

9. Diakoniekrankenhaus Freiburg, Germany