Patrick Aepli1, Jürg Vosbeck2, Jürg Metzger3. 1. Gastroenterology and Hepatology Unit, Department of Medicine, Luzerner Kantonsspital Lucerne, Switzerland. 2. Department of Pathology, Luzerner Kantonsspital Lucerne, Switzerland. 3. Department of Visceral Surgery, Luzerner Kantonsspital Lucerne, Switzerland.