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Meta-analysis of trials comparing warfarin with aspirin in reducing risk of thromboembolism in patients with atrial fibrillation AFASAK=Copenhagen atrial fibrillation, aspirin, and anticoagulation study; EAFT=European atrial fibrillation trial; PATAF=Prevention of arterial thromboembolism in atrial fibrillation; SPAF=Stroke prevention in atrial fibrillation study
