1. Department of Oral and Maxillo-facial Diseases, University of Helsinki, Helsinki, Finland
2. Department of Non-Communicable diseases, World Health Organization, Geneva, Switzerland
3. School of Dentistry, Thammasat University, Bangkok, Thailand
4. Department of Global Health, University of Stellenbosch, Stellenbosch, South Africa
5. WHO-Collaborating Center for Training and Research in Dental Public Health, Tehran, Iran
6. Oral Health Bureau, Ministry of Health and Medical Education, Tehran, Iran
7. Research Center for Caries Prevention, Dentistry Research Institute, and Department of Community Oral Health, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran