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.
Ebel BE, Koepsell TD, Bennett EE, Rivara FP.Ebel BE, et al. Among authors: koepsell td.JAMA. 2003 Feb 19;289(7):879-84. doi: 10.1001/jama.289.7.879.JAMA. 2003.PMID: 12588272Clinical Trial.
Silverstein M, Mack C, Reavis N, Koepsell TD, Gross GS, Grossman DC.Silverstein M, et al. Among authors: koepsell td.JAMA. 2004 Aug 25;292(8):968-71. doi: 10.1001/jama.292.8.968.JAMA. 2004.PMID: 15328329Clinical Trial.