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.
Girsen A, Ala-Kopsala M, Mäkikallio K, Vuolteenaho O, Räsänen J.Girsen A, et al. Among authors: vuolteenaho o.Acta Obstet Gynecol Scand. 2008;87(3):307-12. doi: 10.1080/00016340801899990.Acta Obstet Gynecol Scand. 2008.PMID: 18307070Free article.
Girsen A, Ala-Kopsala M, Mäkikallio K, Vuolteenaho O, Räsänen J.Girsen A, et al. Among authors: vuolteenaho o.Ultrasound Obstet Gynecol. 2007 Mar;29(3):296-303. doi: 10.1002/uog.3934.Ultrasound Obstet Gynecol. 2007.PMID: 17323307Free article.