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.
Heinonen KM, Jokela V.Heinonen KM, et al. Among authors: jokela v.J Perinat Med. 1994;22(1):5-11. doi: 10.1515/jpme.1994.22.1.5.J Perinat Med. 1994.PMID: 8035295