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.
Leung TY, Tam WH, Leung TN, Lok IH, Lau TK.Leung TY, et al. Among authors: leung tn.BJOG. 2002 Jan;109(1):63-7. doi: 10.1111/j.1471-0528.2002.01159.x.BJOG. 2002.PMID: 11843376
Leung TY, Lok IH, Tam WH, Leung TN, Lau TK.Leung TY, et al. Among authors: leung tn.BJOG. 2004 Jun;111(6):546-9. doi: 10.1111/j.1471-0528.2004.00133.x.BJOG. 2004.PMID: 15198781