1. From the Departments of Urology, Johannes-Gutenberg University Medical School, Mainz
2. Klinikum Kassel, Kassel, Rhein.-Westf.
3. Technical University Medical School, Aachen
4. Departments of Gynecology and Obstetrics, Prosper-Hospital, Recklinghausen
5. Heinrich Heine University Medical School, Düsseldorf