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.
Chubb MC, Fuchs AF.Chubb MC, et al.Ann N Y Acad Sci. 1981;374:446-54. doi: 10.1111/j.1749-6632.1981.tb30890.x.Ann N Y Acad Sci. 1981.PMID: 6951445No abstract available.