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.
Chien PF, Arnott N, Gordon A, Owen P, Khan KS.Chien PF, et al. Among authors: khan ks.BJOG. 2000 Feb;107(2):196-208. doi: 10.1111/j.1471-0528.2000.tb11690.x.BJOG. 2000.PMID: 10688503Review.
Clark TJ, Mann CH, Shah N, Khan KS, Song F, Gupta JK.Clark TJ, et al. Among authors: khan ks.BJOG. 2002 Mar;109(3):313-21. doi: 10.1111/j.1471-0528.2002.01088.x.BJOG. 2002.PMID: 11950187Review.