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.
Costa Santos C, Ayres de Campos D, da Costa Pereira A, Bernardes J.Costa Santos C, et al.Obstet Gynecol. 2000 Feb;95(2):309-11. doi: 10.1016/s0029-7844(99)00569-4.Obstet Gynecol. 2000.PMID: 10674600
Costa Santos C, Costa Pereira A, Bernardes J.Costa Santos C, et al.BJOG. 2005 May;112(5):667-9. doi: 10.1111/j.1471-0528.2004.00505.x.BJOG. 2005.PMID: 15842294Review.