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.
Peters HP, Zweers M, Backx FJ, Bol E, Hendriks ER, Mosterd WL, de Vries WR.Peters HP, et al. Among authors: backx fj.Med Sci Sports Exerc. 1999 Jun;31(6):767-73. doi: 10.1097/00005768-199906000-00002.Med Sci Sports Exerc. 1999.PMID: 10378901
Valkenet K, van de Port IG, Dronkers JJ, de Vries WR, Lindeman E, Backx FJ.Valkenet K, et al. Among authors: backx fj.Clin Rehabil. 2011 Feb;25(2):99-111. doi: 10.1177/0269215510380830. Epub 2010 Nov 8.Clin Rehabil. 2011.PMID: 21059667Review.
van Beijsterveldt AM, Krist MR, Schmikli SL, Stubbe JH, de Wit GA, Inklaar H, van de Port IG, Backx FJ.van Beijsterveldt AM, et al. Among authors: backx fj.Inj Prev. 2011 Feb;17(1):e2. doi: 10.1136/ip.2010.027979. Epub 2010 Dec 21.Inj Prev. 2011.PMID: 21177664Free PMC article.Clinical Trial.