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.
Derksen A, Mokkink LB, Rietberg MB, Knol DL, Ostelo RW, Uitdehaag BM.Derksen A, et al. Among authors: mokkink lb.Qual Life Res. 2013 Nov;22(9):2435-41. doi: 10.1007/s11136-013-0375-z. Epub 2013 Feb 26.Qual Life Res. 2013.PMID: 23440564
Mokkink LB, de Vet HCW, Prinsen CAC, Patrick DL, Alonso J, Bouter LM, Terwee CB.Mokkink LB, et al.Qual Life Res. 2018 May;27(5):1171-1179. doi: 10.1007/s11136-017-1765-4. Epub 2017 Dec 19.Qual Life Res. 2018.PMID: 29260445Free PMC article.