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.
Klein LL, Gibbs RS.Klein LL, et al. Among authors: gibbs rs.Obstet Gynecol Clin North Am. 2005 Sep;32(3):397-410. doi: 10.1016/j.ogc.2005.03.001.Obstet Gynecol Clin North Am. 2005.PMID: 16125040Review.