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.
O'Brien TJ, Vajda FJ.O'Brien TJ, et al.Aust N Z J Obstet Gynaecol. 2000 Nov;40(4):413-5. doi: 10.1111/j.1479-828x.2000.tb01171.x.Aust N Z J Obstet Gynaecol. 2000.PMID: 11194426Review.No abstract available.