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6Sacco RL, Adams R, Albers G, et al. Guidelines for prevention of stroke in patients with ischemic stroke or transient ischemic attack: a statement for healthcare professionals from the American Heart Association/American Stroke Association Council on Stroke :co-sponsored by the Council on Cardiovascular Radiology and Intervention : the American Academy of Neurology affirms the value of this guideline. Stroke, 2006,37:577-617.