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.
Berzenji L, Van Schil PE.Berzenji L, et al. Among authors: van schil pe.Eur Respir J. 2019 Jun 20;53(6):1900711. doi: 10.1183/13993003.00711-2019. Print 2019 Jun.Eur Respir J. 2019.PMID: 31221681Free article.No abstract available.