AF.6 IMPACT OF VITAMIN-K ANTAGONISTS AND DIRECT ORAL ANTICOAGULANTS ON SEVERITY OF UPPER GASTROINTESTINAL BLEEDING: A RETROSPECTIVE ANALYSIS OF ITALIAN AND UK DATA. (September 2021) - Brigida, M.; Di Caro, S.; Petruzziello, C.; Riccioni, M.E.; Franceschi, F.; Ojetti, V.