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.
Chung KF, Lammers JW, McCusker M, Roberts NM, Nichol GM, Barnes PJ.Chung KF, et al. Among authors: barnes pj.Eur Respir J. 1989 Sep;2(8):763-8.Eur Respir J. 1989.PMID: 2680584Clinical Trial.
Kharitonov SA, Yates D, Barnes PJ.Kharitonov SA, et al. Among authors: barnes pj.Eur Respir J. 1995 Feb;8(2):295-7. doi: 10.1183/09031936.95.08020295.Eur Respir J. 1995.PMID: 7538934Free article.