title: Letter regarding article by Hylek et al, "Major hemorrhage and tolerability of warfarin in the first year of therapy among elderly patients with atrial fibrillation".
authors.forename: Ayumu
authors.initials: A
authors.lastname: Ono
authors.forename: Ichiko
authors.initials: I
authors.lastname: Kawamura
authors.forename: Toshiro
authors.initials: T
authors.lastname: Fujita
mesh_terms: D000369:Aged, 80 and over; D000925:Anticoagulants / Q000008:administration & dosage* / Q000009:adverse effects; D001281:Atrial Fibrillation / Q000188:drug therapy*; D006470:Hemorrhage / Q000139:chemically induced* / Q000517:prevention & control; D006801:Humans; D014859:Warfarin / Q000008:administration & dosage* / Q000009:adverse effects
chemical_list: D000925:Anticoagulants; D014859:Warfarin