AF.41 THE PROGNOSTIC VALUE OF ENDOSCOPIC MAYO SCORE 0 VERSUS 1 IN PATIENTS WITH ULCERATIVE COLITIS IN STEROID-FREE CLINICAL REMISSION: A SYSTEMATIC REVIEW AND METAANALYSIS. (September 2021) - Valvano, M.; Stefanelli, G.; Vernia, F.; Longo, S.; Castellini, C.; Frieri, G.; Latella, G.; Viscido, A.