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.
Dunn KE, Sigmon SC, Reimann E, Heil SH, Higgins ST.Dunn KE, et al.J Drug Issues. 2009 Apr;39(2):313-328. doi: 10.1177/002204260903900205.J Drug Issues. 2009.PMID: 20401340Free PMC article.