AUTHOR=Jenkins Bradlee A. , Glenn Loyd Lee TITLE=Variability of FEV1 and Criterion for Acute Pulmonary Exacerbation JOURNAL=Frontiers in Pediatrics VOLUME=2 YEAR=2014 URL=https://www.frontiersin.org/journals/pediatrics/articles/10.3389/fped.2014.00114 DOI=10.3389/fped.2014.00114 ISSN=2296-2360