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.
Sperber N, Hall KS, Allen K, DeVellis BM, Lewis M, Callahan LF.Sperber N, et al. Among authors: devellis bm.J Phys Act Health. 2014 Mar;11(3):528-35. doi: 10.1123/jpah.2012-0030. Epub 2013 Feb 8.J Phys Act Health. 2014.PMID: 23416927
DeVellis BM, DeVellis RF.DeVellis BM, et al. Among authors: devellis rf.N C Med J. 2007 Nov-Dec;68(6):434-5.N C Med J. 2007.PMID: 18236863No abstract available.