1. Dental Public Health Program, Department of Community Oral Health, School of Dentistry, Shaheed Beheshti University of Medical Sciences and Health Services, Tehran, IR-Iran
2. Department of Community Oral Health, School of Dentistry, Shaheed Beheshti University of Medical Sciences and Health Services, Tehran, IR-Iran
3. School of Health Education, Shaheed Beheshti University of Medical Sciences and Health Services, Tehran, IR-Iran
4. Department of Health Policy and Management, DeGroote School of Business, McMaster University, Hamilton, Canada
5. Dental Research Center, Research Institute of Dental Sciences, Preventive Dentistry Research Center, Shaheed Beheshti University of Medical Sciences and Health Services, Tehran, IR-Iran