1. Department of Surgery (A), Heinrich‑Heine‑University and University Hospital Duesseldorf, D‑40225 Duesseldorf, Germany
2. Institute of Pathology, Heinrich‑Heine‑University and University Hospital Duesseldorf, D‑40225 Duesseldorf, Germany
3. Coordination Centre for Clinical Trials, Heinrich‑Heine‑University and University Hospital Duesseldorf, D‑40225 Duesseldorf, Germany