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.
Vexler A, Schisterman EF, Liu A.Vexler A, et al. Among authors: schisterman ef.Stat Med. 2008 Jan 30;27(2):280-96. doi: 10.1002/sim.3035.Stat Med. 2008.PMID: 17721905Free PMC article.
Pollack AZ, Perkins NJ, Mumford SL, Ye A, Schisterman EF.Pollack AZ, et al. Among authors: schisterman ef.Am J Epidemiol. 2013 Jan 1;177(1):84-92. doi: 10.1093/aje/kws209. Epub 2012 Dec 7.Am J Epidemiol. 2013.PMID: 23221725Free PMC article.