Walraven, C. van

patient stroke atrial fibrillation aspirin atrial fibrillation study event trial prevention ischemic ischemic stroke anticoagulant stroke prevention therapy warfarin group anticoagulation outcome randomized prediction rule arch intern med ischemia patient age factor nonrheumatic atrial fibrillation 100 patient-years nonvalvular atrial fibrillation scheme hypertension heart af patients treatment analysis origin swets subs service result figure placebo afasak event rate table intern history heart failure prediction death atrial fibrillation investigators non-rheumatic atrial fibrillation patient-year nonvalvular ischemic attack antithrombotic therapy ann intern med diabetes stroke risk blood downloaded framingham february erasmus mc participant investigator hazard effect systolic blood pressure association ratio model hemorrhage stroke rates risk factors failure patient history event rates population antithrombotic attack infarction point