1. Robert Bosch Centre for Tumour Diseases (RBCT), Department of General and Visceral Surgery, Robert-Bosch-Hospital, 70376 Stuttgart, Germany
2. Department of Surgery, Klinikverbund Südwest, Krankenhaus Leonberg, 71229 Leonberg, Germany
3. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany
4. University of Tübingen, 72074 Tübingen, Germany
5. Department of Surgery, University Medical Center Regensburg, 93053 Regensburg, Germany