1. Department for General, Visceral, Endocrine, and Vascular Surgery, Krankenhaus Agatharied GmbH, Hausham, Germany
2. Institute for Surgical Research Oberbayern, Hausham, Germany
3. Department of General, Visceral, and Transplant Surgery, Ludwig-Maximilians-University Munich, Munich, Germany
4. Department of General and Minimal Invasive Surgery, Nordwest Hospital, Frankfurt, Germany
5. Surgical Department, RoMed Klink Bad Aibling, Bad Aibling, Germany