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.
Wehmeier PM, Schacht A, Dittmann RW, Helsberg K, Schneider-Fresenius C, Lehmann M, Bullinger M, Ravens-Sieberer U.Wehmeier PM, et al.Qual Life Res. 2011 Jun;20(5):691-702. doi: 10.1007/s11136-010-9803-5. Epub 2010 Dec 7.Qual Life Res. 2011.PMID: 21136299Clinical Trial.