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.
Edwards LE, Alton IR, Barrada MI, Hakanson EY.Edwards LE, et al.Am J Obstet Gynecol. 1979 Oct 1;135(3):297-302. doi: 10.1016/0002-9378(79)90693-8.Am J Obstet Gynecol. 1979.PMID: 484616
Edwards LE, Hellerstedt WL, Alton IR, Story M, Himes JH.Edwards LE, et al.Obstet Gynecol. 1996 Mar;87(3):389-94. doi: 10.1016/0029-7844(95)00446-7.Obstet Gynecol. 1996.PMID: 8598961