1. Department of Obstetrics and Gynecology, University of Munich
2. Frauenklinik, Franziskus Hospital, Bielefeld
3. Department of Obstetrics and Gynecology, University Marburg
4. Gynecology, DKD, Wiesbaden
5. Department of Obstetrics and Gynecology, Nordwest Hospital, Frankfurt am Main
6. Department of Radiology, Marienhospital, Osnabrueck
7. Department of Obstetrics and Gynecology, University of Greifswald
8. Department of Obstetrics and Gynecology, Hermann-Joseph-Hospital, Erkelenz
9. Department of Radiology, University of Erlangen
10. Breast Center, Hospital Koeln Holweide, Cologne
11. Department of Obstetrics and Gynecology, University of Tuebingen