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.
Fransen GA, van Marrewijk CJ, Mujakovic S, Muris JW, Laheij RJ, Numans ME, de Wit NJ, Samsom M, Jansen JB, Knottnerus JA.Fransen GA, et al. Among authors: knottnerus ja.BMC Med Res Methodol. 2007 Apr 23;7:16. doi: 10.1186/1471-2288-7-16.BMC Med Res Methodol. 2007.PMID: 17451599Free PMC article.Review.
van den Heuvel-Janssen HA, Borghouts JA, Muris JW, Koes BW, Bouter LM, Knottnerus JA.van den Heuvel-Janssen HA, et al. Among authors: knottnerus ja.BMC Fam Pract. 2006 Mar 3;7:12. doi: 10.1186/1471-2296-7-12.BMC Fam Pract. 2006.PMID: 16512926Free PMC article.