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.
Phillips MF, Smith PE, Carroll N, Edwards RH, Calverley PM.Phillips MF, et al. Among authors: smith pe.Am J Respir Crit Care Med. 1999 Jul;160(1):198-202. doi: 10.1164/ajrccm.160.1.9805055.Am J Respir Crit Care Med. 1999.PMID: 10390400
Carroll N, Bain RJ, Smith PE, Saltissi S, Edwards RH, Calverley PM.Carroll N, et al. Among authors: smith pe.Eur Respir J. 1991 Apr;4(4):434-40.Eur Respir J. 1991.PMID: 1855572