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.
Vitorino L, Zé-Zé L, Sousa A, Bacellar F, Tenreiro R.Vitorino L, et al.Ann N Y Acad Sci. 2003 Jun;990:726-33. doi: 10.1111/j.1749-6632.2003.tb07451.x.Ann N Y Acad Sci. 2003.PMID: 12860714