Department of Internal Medicine 1, Gastroenterology, Pulmonology, and Endocrinology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany. Department of Pathology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany. Department of Surgery, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany. Department of Surgery, University of Greifswald, Greifswald, Germany. Department of Radiology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany. Medical Practice of Oncology, Kronach, Germany.