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Dong Y, Pollock N, Stallmann-Jorgensen IS, Gutin B, Lan L, Chen TC, Keeton D, Petty K, Holick MF, Zhu H.Dong Y, et al. Among authors: chen tc.Pediatrics. 2010 Jun;125(6):1104-11. doi: 10.1542/peds.2009-2055. Epub 2010 May 3.Pediatrics. 2010.PMID: 20439594Free PMC article.