1. Department of Surgery, Kantonsspital St. Gallen, St. Gallen, Switzerland.
2. Department of General, Visceral and Transplant Surgery, University Hospital Heidelberg, Heidelberg, Germany.
3. Department of General, Visceral and Thoracic Surgery, University Hospital Carl Gustav Carus Dresden, TU Dresden, Dresden, Germany.
4. Department of Urology, University Hospital Heidelberg, Heidelberg, Germany.
5. Aesculap AG, Am Aesculap-Platz, Tuttlingen, Germany.