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.
Norman RJ, Warnes GM, Wang X, Kirby CA, Matthews CD.Norman RJ, et al. Among authors: matthews cd.Hum Reprod. 1991 Feb;6(2):206-13. doi: 10.1093/oxfordjournals.humrep.a137307.Hum Reprod. 1991.PMID: 1905309
Wang L, Warnes GM, Kirby CA, Matthews CD, Norman RJ.Wang L, et al. Among authors: matthews cd.Hum Reprod. 1990 May;5(4):476-80. doi: 10.1093/oxfordjournals.humrep.a137127.Hum Reprod. 1990.PMID: 2113933