1. Department of Gastroenterology, Universitätsklinikum Ulm, Ulm, Germany
2. Department of Internal Medicine, Division of Gastroenterology, University Hospital Zurich, Zurich, Switzerland
3. Department of Hepatogastroenterology, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, Brussels, Belgium
4. Department of Internal Medicine, St. Elisabeth Hospital,Vienna, Austria
5. Department of Gastroenterology, Sana Klinikum Lichtenberg, Berlin, Germany
6. Department of Gastroenterology, Nuovo Regina Margherita Hospital, Rome, Italy
7. Department of Gastroenterology and Hepatology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
8. Department of Gastroenterology, Ambroise Paré Hospital, Boulogne, France
9. Department of Medical Gastroenterology, Rikshospitalet University Hospital, Oslo, Norway