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Morgan WJ, Wagener JS, Yegin A, Pasta DJ, Millar SJ, Konstan MW; Scientific Advisory Group, investigators; coordinators of the Epidemiologic Study of Cystic Fibrosis.Morgan WJ, et al.J Pediatr. 2013 Oct;163(4):1152-7.e2. doi: 10.1016/j.jpeds.2013.05.013. Epub 2013 Jun 27.J Pediatr. 2013.PMID: 23810128Free PMC article.