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Wright SW, Lindsell CJ, Hinckley WR, Williams A, Holland C, Lewis CH, Heimburger G.Wright SW, et al.BMC Med Educ. 2006 Oct 5;6:49. doi: 10.1186/1472-6920-6-49.BMC Med Educ. 2006.PMID: 17020624Free PMC article.