1. Department of Medicine, Division of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland
2. Department of Medicine, Division of Gastroenterology and Hepatology, Triemlispital Zurich, Zurich, Switzerland
3. Department of Medicine, Division of Gastroenterology and Hepatology, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland
4. 1st Department of Medicine, Semmelweis University, Budapest, Hungary
5. Department of Dermatology, University Hospital Zurich, Zurich, Switzerland