1. Department of Internal Medicine I, Kreiskliniken Reutlingen, Germany
2. Technical Hygiene, Charite, Berlin, Germany
3. Center for Ultrasound and prenatal Medicine, Center for Ultrasound and Prenatal Medicine, Frankfurt, Germany
4. Anesthesia and Critical Care Medicine, Kreisklinikum Calw-Nagold, Calw, Germany
5. Central Ultrasound Department, Bruederkrankenhaus, Trier, Germany
6. Urologie, Praxis, Magdeburg, Germany
7. Urology, Universitatsklinikum Halle, Germany
8. Klinik für Urologie und Kinderurologie, Klinikum Brandenburg, Germany
9. Langenfeld, Germany
10. Department of Gastroenterology, Brandenburg University of Medicine Theodor Fontane, Neuruppin, Germany
11. Orthopedics and Trauma Surgery, Praxis, Hamburg, Germany
12. Institute for Diagnostic and Interventional Radiology, Universitätsmedizin Rostock, Germany
13. Department of Vascular Surgery, Klinikum Herford, Germany
14. Department of Gynekology and Obstetrics, University Hospital, Heidelberg, Germany
15. Internal Medicine III, Universitatsklinikum Aachen, Germany
16. Klinik für Innere Medizin, Krankenhaus Märkisch Oderland Strausberg/ Wriezen, Germany