PC.01.2 ATROPHIC GASTRITIS IN ALL-CAUSE UPPER GASTROINTESTINAL ENDOSCOPY AT A TERTIARY ENDOSCOPIC CENTER: SEVERITY ACCORDING TO THE OLGA STAGING SYSTEM. (25th March 2019) - Franceschi, M.; Rodriguez-Castro, K.I.; Ferronato, A.; Cuoco, L.; Di Mario, F.; Miraglia, C.; Gasparri, R.L.; Morini, A.; Pertoldi, B.; Sella, D.; Baldassarre, G.