1. 1Department of General, Visceral, Cancer and Transplant Surgery, University Hospital of Cologne, Cologne, Germany
2. 2Polyclinic for Endocrinology, Diabetes and Preventive Medicine, University Hospital of Cologne, Cologne, Germany
3. 3Department of Pathology, University Hospital of Cologne, Cologne, Germany
4. 4Department of Radiation Therapy, University Hospital of Cologne, Cologne, Germany
5. 5Department of Nuclear Medicine, Faculty of Medicine, University Hospital of Cologne, Cologne, Germany