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.
Pylypchuk Y, Selden TM.Pylypchuk Y, et al. Among authors: selden tm.J Health Econ. 2008 Jul;27(4):1109-1128. doi: 10.1016/j.jhealeco.2007.12.001. Epub 2007 Dec 23.J Health Econ. 2008.PMID: 18242743