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.
Chen MM, Chang HC, Hsieh CF, Yen MF, Chen TH.Chen MM, et al. Among authors: chang hc.Arch Phys Med Rehabil. 2005 Nov;86(11):2199-203. doi: 10.1016/j.apmr.2005.05.010.Arch Phys Med Rehabil. 2005.PMID: 16271571
Chang HC, Hsiung HY, Chen SI, Yen AM, Chen TH.Chang HC, et al.J Public Health (Oxf). 2007 Jun;29(2):165-72. doi: 10.1093/pubmed/fdm003. Epub 2007 Mar 27.J Public Health (Oxf). 2007.PMID: 17389674