1. Department of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland
2. Department of Internal Medicine, Hospital Oberndorf, Teaching Hospital of the Paracelsus Private University of Salzburg, Oberndorf, Austria
3. Medical Department 1, University Hospital Dresden, TU Dresden, Dresden, Germany
4. Division of Gastroenterology and Hepatology, Department of Medicine and Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA