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Sampson M, Barrowman NJ, Moher D, Clifford TJ, Platt RW, Morrison A, Klassen TP, Zhang L.Sampson M, et al.BMC Med Res Methodol. 2006 Feb 24;6:7. doi: 10.1186/1471-2288-6-7.BMC Med Res Methodol. 2006.PMID: 16504110Free PMC article.
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