Boode, B.S.P.

stroke patient atrial fibrillation atrial fibrillation study aspirin patient age prevention ischemic stroke therapy trial scheme 100 patient-years ischemic stroke prevention warfarin swets subs service factor analysis participant treatment heart failure event outcome heart antithrombotic therapy randomized patient-year nonvalvular atrial fibrillation table point hemorrhage arch intern med nonrheumatic atrial fibrillation risk factors atrial fibrillation investigators investigator ann intern med group failure anticoagulation hazard ratio effect figure non-rheumatic atrial fibrillation framingham result diabetes hypertension model antithrombotic af patients aspirin therapy hazard service ratio score stratification placebo interaction stroke risk university downloaded intern benefit february nonvalvular randomization chads 2 randomized trials stroke rates embolism efficacy prevention participants cohort ischemia ͻ0.0001 increase stroke rate