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Kalmbach K, Robinson LG Jr, Wang F, Liu L, Keefe D.Kalmbach K, et al. Among authors: keefe d.Biomed Res Int. 2014;2014:925121. doi: 10.1155/2014/925121. Epub 2014 Feb 27.Biomed Res Int. 2014.PMID: 24719895Free PMC article.Review.