1. Division of Gastroenterology and Endocrinology Rostock University Medical Center Rostock 18057 Germany
2. Research and Development Zealand Pharma Søborg 2860 Denmark
3. Rudolf‐Zenker‐Institute for Experimental Surgery Rostock University Medical Center Rostock 18057 Germany
4. Department of General, Visceral, Thoracic, Vascular and Transplantat Surgery Rostock University Medical Center Rostock 18057 Germany