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.
Shetty A, Stewart K, Stewart G, Rice P, Danielian P, Templeton A.Shetty A, et al.BJOG. 2002 Dec;109(12):1354-8. doi: 10.1046/j.1471-0528.2002.02082.x.BJOG. 2002.PMID: 12504970Clinical Trial.
Black M, Mitchell E, Danielian P.Black M, et al.Acta Obstet Gynecol Scand. 2013 Dec;92(12):1383-7. doi: 10.1111/aogs.12265. Epub 2013 Oct 24.Acta Obstet Gynecol Scand. 2013.PMID: 24111562Free article.