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Dawson J, Lees JS, Chang TP, Walters MR, Ali M, Davis SM, Diener HC, Lees KR; GAIN and VISTA Investigators.Dawson J, et al.Stroke. 2007 Jun;38(6):1893-8. doi: 10.1161/STROKEAHA.106.472381. Epub 2007 Apr 19.Stroke. 2007.PMID: 17446431Free article.