Related Articles A cohort study showed that health insurance databases were accurate to distinguish chronic obstructive pulmonary disease from asthma and classify disease severity. J Clin Epidemiol. 2005 Feb;58(2):206-8 Authors: McKnight J, Scott A, Menzies D, Bourbeau J, Blais L, Lemière C PMID: 15680756 [PubMed - indexed for MEDLINE]