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.
Potter JE, Coleman-Minahan K, White K, Powers DA, Dillaway C, Stevenson AJ, Hopkins K, Grossman D.Potter JE, et al.Obstet Gynecol. 2017 Aug;130(2):393-402. doi: 10.1097/AOG.0000000000002136.Obstet Gynecol. 2017.PMID: 28697112Free PMC article.