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.
Mohapatra TP, Kumar S.Mohapatra TP, et al. Among authors: kumar s.Postgrad Med J. 1989 Apr;65(762):256-7. doi: 10.1136/pgmj.65.762.256.Postgrad Med J. 1989.PMID: 2594604Free PMC article.