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.
Guille C, Simpson AN, Douglas E, Boyars L, Cristaldi K, McElligott J, Johnson D, Brady K.Guille C, et al. Among authors: johnson d.JAMA Netw Open. 2020 Jan 3;3(1):e1920177. doi: 10.1001/jamanetworkopen.2019.20177.JAMA Netw Open. 2020.PMID: 32003816Free PMC article.
Hulsey TC, McComb TF, Ebeling M, Geddes K, Kuenneth CA, Johnson D, Alexander GR, Pittard WB.Hulsey TC, et al. Among authors: johnson d.Matern Child Health J. 1998 Dec;2(4):211-21. doi: 10.1023/a:1022355306397.Matern Child Health J. 1998.PMID: 10728278
Unal ER, Robinson CJ, Johnson DD, Chang EY.Unal ER, et al. Among authors: johnson dd.Am J Obstet Gynecol. 2007 Aug;197(2):211.e1-4. doi: 10.1016/j.ajog.2007.05.022.Am J Obstet Gynecol. 2007.PMID: 17689655