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.
Ritt-Olson A, Unger J, Valente T, Nezami E, Chou CP, Trinidad D, Milam J, Earleywine M, Tan S, Johnson CA.Ritt-Olson A, et al.Subst Use Misuse. 2005;40(1):77-98. doi: 10.1081/ja-200030505.Subst Use Misuse. 2005.PMID: 15702650