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.
Yeung WS, Ng VK, Lau EY, Ho PC.Yeung WS, et al.Hum Reprod. 1994 Apr;9(4):656-60. doi: 10.1093/oxfordjournals.humrep.a138566.Hum Reprod. 1994.PMID: 8046018
Yao Y, Ho P, Yeung WS.Yao Y, et al. Among authors: yeung ws.Fertil Steril. 1999 Dec;72(6):1079-84. doi: 10.1016/s0015-0282(99)00420-3.Fertil Steril. 1999.PMID: 10593385Free article.
Yao Y, Ho Pc, Yeung WS.Yao Y, et al. Among authors: yeung ws.Fertil Steril. 2000 Mar;73(3):479-86. doi: 10.1016/s0015-0282(99)00563-4.Fertil Steril. 2000.PMID: 10688999Free article.