1. Clinician Scientist Program, Interdisciplinary Center for Clinical Research (IZKF), Department of Radiotherapy and Radiation Oncology, Jena University Hospital, 07747 Jena, Germany
2. Department of Radiotherapy and Radiation Oncology, Jena University Hospital, 07747 Jena, Germany
3. University Tumor Center (UTC), Jena University Hospital, 07747 Jena, Germany
4. Department of General, Visceral and Vascular Surgery, Jena University Hospital, 07747 Jena, Germany
5. Department of General, Visceral and Thoracic Surgery, Thuringia-Clinic Saalfeld Georgius Agricola, 07318 Saalfeld, Germany
6. Department of General, Visceral and Vascular Surgery, Sophien-und Hufeland-Klinikum Weimar, 99425 Weimar, Germany
7. Department of General and Visceral Surgery, SRH Wald-Klinikum Gera, 07548 Gera, Germany
8. Department of General, Visceral and Vascular Surgery, Robert-Koch-Hospital, 99510 Apolda, Germany