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.
Levine AS, Billington CJ.Levine AS, et al. Among authors: billington cj.Ann N Y Acad Sci. 1989;575:209-19; discussion 219-20. doi: 10.1111/j.1749-6632.1989.tb53244.x.Ann N Y Acad Sci. 1989.PMID: 2699188Review.No abstract available.