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.
Meldgaard E, Lauridsen HH, Hestbaek L.Meldgaard E, et al.BMJ Open. 2021 May 13;11(5):e045580. doi: 10.1136/bmjopen-2020-045580.BMJ Open. 2021.PMID: 33986055Free PMC article.
Heidemann CH, Godballe C, Kjeldsen AD, Johansen EC, Faber CE, Lauridsen HH.Heidemann CH, et al.Health Qual Life Outcomes. 2013 Nov 20;11:201. doi: 10.1186/1477-7525-11-201.Health Qual Life Outcomes. 2013.PMID: 24257471Free PMC article.