1. Clinic for General and Visceral Surgery, University Hospital Brandenburg an der Havel, Brandenburg Medical University, Brandenburg an der Havel, Germany
2. Department of General, Visceral and Cancer Surgery, Helios Klinikum Berlin-Buch, Berlin, Germany
3. Medical School, Charité – University Medicine Berlin, Berlin, Germany
4. Institute for Research in Operative Medicine (IFOM), Witten/Herdecke University, Cologne, Germany
5. Faculty of Health, Witten/Herdecke University, Witten, Germany