1. University Hospital Cologne, Department of General, Visceral, Cancer and Transplant Surgery, Cologne, Germany

2. University Hospital Cologne, Department of Pediatric Oncology, Cologne, Germany

3. University Hospital Cologne, Centre for Endocrinology, Diabetes and Preventive Medicine, Cologne, Germany

4. University Hospital Cologne, Department of Pathology, Cologne, Germany

5. University Hospital Cologne Faculty of Medicine, Department of Nuclear Medicine, Cologne, Germany