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.
Merrall EL, Bird SM, Hutchinson SJ.Merrall EL, et al.Int J Drug Policy. 2012 Jan;23(1):24-32. doi: 10.1016/j.drugpo.2011.05.010. Epub 2011 Jun 30.Int J Drug Policy. 2012.PMID: 21719267Free PMC article.
Merrall EL, Bird SM, Hutchinson SJ.Merrall EL, et al.Addiction. 2013 Feb;108(2):377-84. doi: 10.1111/j.1360-0443.2012.04066.x. Epub 2012 Nov 1.Addiction. 2013.PMID: 22925008