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Ren CL, Morgan WJ, Konstan MW, Schechter MS, Wagener JS, Fisher KA, Regelmann WE; Investigators and Coordinators of the Epidemiologic Study of Cystic Fibrosis.Ren CL, et al.Pediatr Pulmonol. 2007 Jun;42(6):513-8. doi: 10.1002/ppul.20604.Pediatr Pulmonol. 2007.PMID: 17469151
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