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.
Cherpitel CJ, Robertson M, Ye Y, Borges G, Bautista CF, Lown A, Greenfield T, Bond J.Cherpitel CJ, et al.Subst Use Misuse. 2007;42(11):1685-703. doi: 10.1080/10826080701209085.Subst Use Misuse. 2007.PMID: 17934990
Bond JC, Roberts SC, Greenfield TK, Korcha R, Ye Y, Nayak MB.Bond JC, et al.Int J Environ Res Public Health. 2010 May;7(5):2136-60. doi: 10.3390/ijerph7052136. Epub 2010 May 4.Int J Environ Res Public Health. 2010.PMID: 20623016Free PMC article.