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.
Hebert PC, Drummond AJ, Singer J, Bernard GR, Russell JA.Hebert PC, et al. Among authors: russell ja.Chest. 1993 Jul;104(1):230-5. doi: 10.1378/chest.104.1.230.Chest. 1993.PMID: 8325076
Hawley PH, Chan N, Russell JA, Montaner JS.Hawley PH, et al. Among authors: russell ja.Chest. 1996 Apr;109(4):1130-1. doi: 10.1378/chest.109.4.1130-a.Chest. 1996.PMID: 8635352No abstract available.