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.
Gruet M, Peyré-Tartaruga LA, Mely L, Vallier JM.Gruet M, et al.Respir Care. 2016 Dec;61(12):1620-1628. doi: 10.4187/respcare.04821. Epub 2016 Nov 15.Respir Care. 2016.PMID: 27899540Free article.