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.
Reed M, Benedetti N, Brand R, Newhouse JP, Hsu J.Reed M, et al. Among authors: hsu j.BMC Health Serv Res. 2009 Dec 29;9:244. doi: 10.1186/1472-6963-9-244.BMC Health Serv Res. 2009.PMID: 20040076Free PMC article.