P4237Gastrointestinal bleeding is associated with gastrointestinal cancer in patients with atrial fibrillation treated with anticoagulants - a nationwide study. (28th August 2018) - Rasmussen, P V; Dalgaard, F; Brandes, A; Johnsen, S P; Munster, A M B; Grove, E L; Pedersen, L; Torp-Pedersen, C; Gislason, G H; Pallisgaard, J L; Hansen, M L