1. Institute of Pathology, Visceral and Cancer Surgery, University Hospital of Cologne, D‑50937 Cologne, Germany
2. Department of General, Visceral and Cancer Surgery, University Hospital of Cologne, D‑50937 Cologne, Germany
3. Institute of Pathology, University Hospital Berlin‑Charite, D‑10117 Berlin, Germany
4. Department of Internal Medicine I, University Hospital of Cologne, D‑50937 Cologne, Germany