2009;40(4): 1410-1416. 21. Lin LY, Lee CH, Yu CC, et al. Risk factors and incidence of ischemic stroke in Taiwanese with nonvalvular atrial brillation a nation wide database analysis. Atherosclerosis. 2011;217(1):292-295. 22. Frost L, Engholm G, Johnsen S, M ller H, Husted S. Incident stroke after discharge from the hospital with a diagnosis of atrial brillation. Am J Med. 2000;108(1):36-40. 23. The Stroke Prevention in Atrial Fibrillation Investigators Committee on Echocardiography. Transesophageal echo- cardiographic correlates of thromboembolism in high-risk patients with nonvalvular atrial brillation. Ann Intern Med. 1998;128(8):639-647. 24. Olesen JB, Lip GY, Hansen ML, et al. Validation of risk strati cation schemes for predicting stroke and throm- boembolism in patients with atrial brillation: nationwide cohort study. BMJ. 2011;342:d124. 25. Stroke Prevention in Atrial Fibrillation Investigators. Risk factors for thromboembolism during aspirin therapy in patients with atrial brillation: the Stroke Prevention in Atrial Fibrillation Study. J Stroke Cerebrovasc Dis. 1995;5(3): 147-157. 26. van Latum JC, Koudstaal PJ, Venables GS, van Gijn J, Kappelle LJ, Algra A; European Atrial Fibrillation Trial (EAFT) Study Group. Predictors of major vascular events in patients with a transient ischemic attack or minor ischemic stroke and with nonrheumatic atrial brillation. Stroke. 1995;26(5):801-806. 27. Echocardiographic predictors of stroke in patients with atrial brillation: a prospective study of 1066 patients from 3 clinical trials. Arch Intern Med. 1998;158(12):1316-1320. 28. Hart RG, Pearce LA, McBride R, Rothbart RM, Asinger RW; The Stroke Prevention in Atrial Fibrillation (SPAF) Investigators. Factors associated with ischemic stroke during aspirin therapy in atrial brillation: analysis of 2012 participants in the SPAF I-III clinical trials. Stroke. 1999;30(6):1223-1229. 29. Fuster V, Ryd n LE, Cannom DS, et al; American College of Cardiology/American Heart Association Task Force References 1. Lloyd-Jones DM, Wang TJ, Leip EP, et al. 