1. Department of Surgery and Transplantation; University Hospital RWTH Aachen; Aachen Germany
2. Institute for Laboratory Animal Science; University Hospital RWTH Aachen; Aachen Germany
3. Department of Surgery; Maastricht University Medical Centre (MUMC); Maastricht The Netherlands
4. Department of Gastroenterology, Metabolic Disorders and Intensive Care; University Hospital RWTH Aachen; Aachen Germany