1. Digestive Endoscopy Unit Scientific Institute for Research, Hospitalization, and Health Care, Fondazione Policlinico Universitario A. Gemelli, Catholic University Rome Italy
2. Gastroenterology Department Colentina Clinical Hospital, Carol Davila University of Medicine Bucharest Romania
3. Gastroenterology Division Scientific Institute for Research, Hospitalization, and Health Care, Fondazione Policlinico Universitario A. Gemelli, Catholic University Rome Italy
4. Instituts Hospitalo‐Universitaires – University of Strasbourg Institute of Advanced Study Strasbourg France