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.
van Uden CJ, Nieman FH, Voss GB, Wesseling G, Winkens RA, Crebolder HF.van Uden CJ, et al. Among authors: nieman fh.BMC Health Serv Res. 2005 Mar 31;5(1):27. doi: 10.1186/1472-6963-5-27.BMC Health Serv Res. 2005.PMID: 15801985Free PMC article.