Accepted for Publication: August 2, 2014.
Published Online: October 13, 2014. doi:10.1001/jamainternmed.2014.5219.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: Rostron, Chang.
Drafting of the manuscript: Rostron, Pechacek.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Rostron.
Administrative, technical, or material support: Chang, Pechacek.
Study supervision: Pechacek
Conflict of Interest Disclosures: None reported.
Disclaimer: The views and opinions expressed in this article are those of the authors only and do not necessarily represent the views, official policy, or position of the US Department of Health and Human Services or any of its affiliated institutions or agencies.
Additional Contributions: Catherine Corey, MSPH, and Priscilla Callahan-Lyon, MD, of the US Food and Drug Administration provided technical advice regarding chronic obstructive pulmonary disease classification and reporting, and Benjamin Apelberg, PhD, of the US Food and Drug Administration coordinated this project. None received financial compensation.