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.
Lloyd RE, Romar R, Matás C, Gutiérrez-Adán A, Holt WV, Coy P.Lloyd RE, et al. Among authors: holt wv.Reproduction. 2009 Apr;137(4):679-87. doi: 10.1530/REP-08-0405. Epub 2009 Jan 19.Reproduction. 2009.PMID: 19153191