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.
Megens A, Harris SR.Megens A, et al. Among authors: harris sr.Phys Ther. 1998 Dec;78(12):1302-11. doi: 10.1093/ptj/78.12.1302.Phys Ther. 1998.PMID: 9859949Review.