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.
Williams M, Hill CJ, Scudamore I, Dunphy B, Cooke ID, Barratt CL.Williams M, et al. Among authors: cooke id.Hum Reprod. 1993 Dec;8(12):2019-26. doi: 10.1093/oxfordjournals.humrep.a137975.Hum Reprod. 1993.PMID: 8150897Clinical Trial.
Williams M, Thompson LA, Li TC, Mackenna A, Barratt CL, Cooke ID.Williams M, et al. Among authors: cooke id.Hum Reprod. 1993 Jun;8(6):925-8. doi: 10.1093/oxfordjournals.humrep.a138168.Hum Reprod. 1993.PMID: 8345087