1 | Center for Tobacco Control Research, Zhejiang University School of Medicine, Hangzhou, China |
2 | Health Services Administration Program, University of Evansville, Evansville, USA |
3 | Public Health Studies Program, School of Health and Applied Human Sciences, University of North Carolina, Wilmington, USA |
4 | Department of Epidemiology, School of Public Health, and Injury Control Research Center, West Virginia University, Morgantown, USA |