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.