1. Digestive Endoscopy UnitFondazione Policlinico Universitario A. GemelliRomeItaly
2. Institute of PathologyFondazione Policlinico Universitario A. GemelliRomeItaly
3. Endoscopy UnitNuovo Regina Margherita HospitalRomeItaly
4. IHU‐USIASUniversity of StrasbourgFrance