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.
Ohsugi Y, Gershwin ME, Owens RB, Nelson-Rees WA.Ohsugi Y, et al.J Natl Cancer Inst. 1980 Oct;65(4):715-8. doi: 10.1093/jnci/65.4.715.J Natl Cancer Inst. 1980.PMID: 6932523