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.
Chapman DP, Wheaton AG, Anda RF, Croft JB, Edwards VJ, Liu Y, Sturgis SL, Perry GS.Chapman DP, et al. Among authors: croft jb.Sleep Med. 2011 Sep;12(8):773-9. doi: 10.1016/j.sleep.2011.03.013. Epub 2011 Jun 24.Sleep Med. 2011.PMID: 21704556
Ford ES, Anda RF, Edwards VJ, Perry GS, Zhao G, Li C, Croft JB.Ford ES, et al. Among authors: croft jb.Prev Med. 2011 Sep;53(3):188-93. doi: 10.1016/j.ypmed.2011.06.015. Epub 2011 Jun 25.Prev Med. 2011.PMID: 21726575