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.
Bahado-Singh R, Oz U, Deren O, Kovanchi E, Hsu CD, Copel J, Mari G.Bahado-Singh R, et al.Am J Obstet Gynecol. 2000 May;182(5):1222-6. doi: 10.1016/s0002-9378(00)70189-x.Am J Obstet Gynecol. 2000.PMID: 10819862Free article.