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.
Nazir SA, Al-Hamed MM, Erbland ML.Nazir SA, et al. Among authors: erbland ml.Clin Chest Med. 2007 Dec;28(4):703-15, vi. doi: 10.1016/j.ccm.2007.07.003.Clin Chest Med. 2007.PMID: 17967289Review.
Nazir SA, Erbland ML.Nazir SA, et al. Among authors: erbland ml.Drugs Aging. 2009;26(10):813-31. doi: 10.2165/11316760-000000000-00000.Drugs Aging. 2009.PMID: 19761275Review.