An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Zeitlin PL, Diener-West M, Callahan KA, Lee S, Talbot CC Jr, Pollard B, Boyle MP, Lechtzin N.Zeitlin PL, et al. Among authors: boyle mp.Ann Am Thorac Soc. 2017 Feb;14(2):220-229. doi: 10.1513/AnnalsATS.201608-649OC.Ann Am Thorac Soc. 2017.PMID: 28006108Free PMC article.Clinical Trial.