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.
Cohen JI.Cohen JI.Proc Natl Acad Sci U S A. 1992 Sep 1;89(17):8030-4. doi: 10.1073/pnas.89.17.8030.Proc Natl Acad Sci U S A. 1992.PMID: 1325641Free PMC article.
Straus SE, Cohen JI, Tosato G, Meier J.Straus SE, et al. Among authors: cohen ji.Ann Intern Med. 1993 Jan 1;118(1):45-58. doi: 10.7326/0003-4819-118-1-199301010-00009.Ann Intern Med. 1993.PMID: 8380053Review.