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van Walraven C, Hart RG, Singer DE, Laupacis A, Connolly S, Petersen P, Koudstaal PJ, Chang Y, Hellemons B
Oral anticoagulants vs aspirin in nonvalvular atrial fibrillation: an individual patient meta-analysis
JAMA. 2002 Nov 20;288(19):2441-8