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.
Ylijoki M, Ekholm E, Haataja L, Lehtonen L; PIPARI study group.Ylijoki M, et al. Among authors: ekholm e.Acta Obstet Gynecol Scand. 2012 Apr;91(4):403-19. doi: 10.1111/j.1600-0412.2012.01349.x. Epub 2012 Feb 22.Acta Obstet Gynecol Scand. 2012.PMID: 22230024Free article.Review.