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Heckman CJ, Darlow S, Cohen-Filipic J, Kloss JD, Manne SL, Munshi T, Perlis CS.Heckman CJ, et al.Int J Environ Res Public Health. 2012 Jun;9(6):2241-51. doi: 10.3390/ijerph9062241. Epub 2012 Jun 18.Int J Environ Res Public Health. 2012.PMID: 22829801Free PMC article.