1. Faculty of Public Health, Mahidol University, Bangkok 10400, Thailand
2. Thailand Health Promotion Institute, Bangkok 10330, Thailand
3. Tobacco Control Research and Knowledge Management Center, Bangkok 10400, Thailand
4. Faculty of Business Administration, Bangkok-Thonburi University, Bangkok 10170, Thailand
5. Department of Ophthalmology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand