1. Department of Health, Behavior & Society, Johns Hopkins University Bloomberg School of Public Health , 624 North Broadway, Baltimore, MD 21205 , USA
2. Institute for Global Tobacco Control, Johns Hopkins University Bloomberg School of Public Health , 2213 McElderry St., 4th Floor, Baltimore, MD , USA
3. Department of Health Policy and Management, Johns Hopkins University Bloomberg School of Public Health , Baltimore, MD, 624 North Broadway, Baltimore, MD 21205 , USA