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.
Santhanakrishnan M, Ray K, Oppenheimer K, Bonney EA.Santhanakrishnan M, et al. Among authors: bonney ea.Placenta. 2008 Nov;29(11):932-6. doi: 10.1016/j.placenta.2008.08.021. Epub 2008 Oct 19.Placenta. 2008.PMID: 18930541Free PMC article.