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.
Kost ER, Snyder RR, Schwartz LE, Hankins GD.Kost ER, et al. Among authors: snyder rr.Obstet Gynecol. 1993 Jan;81(1):127-30.Obstet Gynecol. 1993.PMID: 8416447