An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
. Author manuscript; available in PMC: 2017 Apr 6.
Published in final edited form as: Tob Prev Cessat. 2016 Oct 5;2(Suppl):6. doi: 10.18332/tpc/65229
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non Commercial 0.4 International License. (http://creativecommons.org/licenses/by/4.0).