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.
Abramson C.Abramson C.Ann N Y Acad Sci. 1974 Jul 31;236(0):495-507. doi: 10.1111/j.1749-6632.1974.tb41513.x.Ann N Y Acad Sci. 1974.PMID: 4529202No abstract available.