1. Department of Obstetrics and Gynecology; Medical School; University of Heidelberg; Heidelberg Germany
2. Department of Diagnostic and Interventional Radiology; University Hospital Heidelberg; Heidelberg Germany
3. Medical Faculty; Department of Diagnostic and Interventional Radiology; University Duesseldorf; Duesseldorf Germany
4. Department of Obstetrics and Gynecology; St. Marienkrankenhaus Ludwigshafen; Academic Teaching Hospital of the Faculty of Medicine Mannheim of the University Medical School Heidelberg; Ludwigshafen am Rhein Germany
5. Pelvic Floor Research Group; Obstetrics and Gynecology Department; University of Michigan; Ann Arbor Michigan
6. Pelvic Floor Research Group; Biomedical Engineering Department; University of Michigan; Ann Arbor Michigan