1. AUSL Romagna, Gastroenterology and Digestive Endoscopy Unit, Forlì-Cesena Hospitals, 47121 Forlì-Cesena, Italy
2. Humanitas Research Hospital, Digestive Endoscopy Unit, Division of Gastroenterology, Rozzano, 20089 Milan, Italy
3. Humanitas University, Department of Biomedical Sciences, 20090 Pieve Emanuele, Italy
4. Digestive Endoscopy and Gastroenterology Unit, Department of Gastroenterology, Istituto Mediterraneo per i Trapianti e Terapie ad Alta Specializzazione (IsMeTT/UPMC), 90127 Palermo, Italy
5. Fondazione I.R.C.C.S. Policlinico San Matteo, Gastroenterology and Digestive Endoscopy Unit, 27100 Pavia, Italy