Standardization of a pulmonary exacerbation score designed to uniformly identify pulmonary exacerbations in cystic fibrosis is associated with continued improvement in pulmonary function [abstract] - Kraynack,N.C.; Singh,C.M.; Sheers,T.G.; Bryson,E.A.; McBride,J.T. (Pediatr Pulmonol Suppl, 2007)