AF.126 IMPROVING DIAGNOSTIC ACCURACY IN ENDOSCOPIC CLASSIFICATION SYSTEM: ROLE OF ADVANCED TRAINING COURSE. (September 2021) - Sbrancia, M.; Gibiino, G.; Frazzoni, L.; Fusaroli, P.; Spada, C.; Calì, A.; Binda, C.; Petruzziello, L.; Gizzi, G.; Fuccio, L.; Fabbri, C.