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.
Lassenius MI, Toppila I, Pöntynen N, Kasslin L, Kaunisto J, Kilpeläinen M, Laitinen T.Lassenius MI, et al. Among authors: toppila i.Eur Clin Respir J. 2019 Dec 17;7(1):1702618. doi: 10.1080/20018525.2019.1702618. eCollection 2020.Eur Clin Respir J. 2019.PMID: 32002175Free PMC article.