[1] University Hospital Schleswig-Holstein,Department of Radiation Oncology
[2] Campus Luebeck,Department of Radiation Oncology
[3] University Medical Center Hamburg-Eppendorf,Department of General, Visceral and Thoracic Surgery
[4] University Medical Center Hamburg-Eppendorf,Department of Gastroenterology
[5] University Hospital Schleswig-Holstein,Department of Radiation Oncology
[6] Campus Luebeck,Department of Radiation Oncology
[7] Mayo Clinic,undefined
[8] University Hospital Schleswig-Holstein Campus Luebeck,undefined