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.
van Dijk-de Vries A, van Bokhoven MA, Winkens B, Terluin B, Knottnerus JA, van der Weijden T, van Eijk JT.van Dijk-de Vries A, et al. Among authors: knottnerus ja.BMJ Open. 2015 Jun 25;5(6):e007014. doi: 10.1136/bmjopen-2014-007014.BMJ Open. 2015.PMID: 26112220Free PMC article.Clinical Trial.