Funding for this research was provided by:
National Council of Science and Technology (SALUD-2013-1-202671)
Received: 17 May 2018
Accepted: 24 September 2018
First Online: 3 October 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Review Board of the National Institute of Public Health of Mexico. All the participants provided written consent to participate in the International Tobacco Control Policy Evaluation Project.
: No data from participants is being published in this study.
: The authors declare that they have no competing interests.
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