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.
Vaz-Silva J, Carneiro MM, Ferreira MC, Pinheiro SV, Silva DA, Silva-Filho AL, Witz CA, Reis AM, Santos RA, Reis FM.Vaz-Silva J, et al. Among authors: ferreira mc.Reprod Sci. 2009 Mar;16(3):247-56. doi: 10.1177/1933719108327593. Epub 2009 Jan 22.Reprod Sci. 2009.PMID: 19164480