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.
de Vries ST, Haaijer-Ruskamp FM, de Zeeuw D, Denig P.de Vries ST, et al.Qual Life Res. 2014 Nov;23(9):2439-45. doi: 10.1007/s11136-014-0715-7. Epub 2014 May 22.Qual Life Res. 2014.PMID: 24848596