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.
Gasper PW, Thrall MA, Wenger DA, Macy DW, Ham L, Dornsife RE, McBiles K, Quackenbush SL, Kesel ML, Gillette EL, et al.Gasper PW, et al. Among authors: thrall ma.Nature. 1984 Nov 29-Dec 5;312(5993):467-9. doi: 10.1038/312467a0.Nature. 1984.PMID: 6438532