P2505Comparison of serious adverse events in very elderly Asian atrial fibrillation patients with or without anticoagulation therapy: direct oral anticoagulants vs. warfarin vs. non-anticoagulants. (28th August 2018) - Sakamoto, A; Okawa, K; Hara, S; Taya, S; Sudo, Y; Sogo, M; Ugawa, S; Okada, T; Nosaka, K; Takahashi, M; Sakane, K; Doi, M