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.
Kelly BJ, Luce JM.Kelly BJ, et al. Among authors: luce jm.Chest. 1991 Jun;99(6):1485-94. doi: 10.1378/chest.99.6.1485.Chest. 1991.PMID: 2036834No abstract available.