OC.06.2 PREVALENCE, CLINICAL FEATURES AND MORTALITY IN SERONEGATIVE COELIAC DISEASE: A COHORT STUDY FROM TWO INTERNATIONAL CENTRES OVER 19 YEARS. (1st October 2020) - Schiepatti, A.; Maimaris, S.; Porta, P.; Marks, L.J.; Kurien, M.; Key, T.; Goodwin, J.; Klersy, C.; Biagi, F.; Sanders, D.S.