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Ziegenfuss JY, Burmeister K, James KM, Haas L, Tilburt JC, Beebe TJ.Ziegenfuss JY, et al. Among authors: tilburt jc.BMC Med Res Methodol. 2012 Mar 31;12:41. doi: 10.1186/1471-2288-12-41.BMC Med Res Methodol. 2012.PMID: 22463734Free PMC article.