1. Division of Gastroenterology and Hepatology Centre Hospitalier Universitaire Vaudois University of Lausanne Lausanne Switzerland
2. Department of Gastroenterology and Hepatology CHU UCL NamurUniversité Catholique de Louvain Yvoir Belgium
3. Division of Immunology and Allergology Centre Hospitalier Universitaire Vaudois University of Lausanne Lausanne Switzerland
4. Department of Gastroenterology, Hepatopancreatology, and Digestive Oncology CUB Hôpital ErasmeUniversité Libre de Bruxelles Brussels Belgium
5. Department of Gastroenterology and Hepatology Clinique St‐Luc Bouge Belgium