1. Department of Environmental Health and Institute of Health and Environment, Graduate School of Public Health, Seoul National University, Seoul, Korea
2. Tobacco Policy Research Program, College of Nursing, University of Kentucky, Lexington, KY, USA
3. UK HealthCare, University of Kentucky, Lexington, KY, USA
4. Counseling Psychology, College of Education, University of Kentucky, Lexington, KY, USA
5. College of Communication and Information Studies, University of Kentucky, Lexington, KY, USA