1. Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
2. Koret School of Veterinary Medicine, Hebrew University of Jerusalem, Rehovot, Israel
3. Department of Visceral and Transplantation Surgery, University Hospital Zurich, University of Zurich, Zurich, Switzerland
4. Calypso Biotech SA, Plan-les-Ouates, Geneva, Switzerland