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.
Walker ER, Pratt LA, Schoenborn CA, Druss BG.Walker ER, et al. Among authors: pratt la.Drug Alcohol Depend. 2017 Feb 1;171:31-38. doi: 10.1016/j.drugalcdep.2016.11.026. Epub 2016 Nov 24.Drug Alcohol Depend. 2017.PMID: 28012429Free PMC article.