P.01.18 PREVALENCE OF AUTOIMMUNE GASTRITIS IN AUTOIMMUNE DISEASES: A POPULATION STUDY BASED ON A NON-INVASIVE TEST. (25th March 2019) - Di Mario, F.; Speroni, S.; Franceschi, M.; Baldassarre, G.; Antico, A.; Panozzo, M.P.; Rodriguez-Castro, K.I.; Nouvenne, A.; Crafa, P.; Franzoni, L.; Di Mario, F.