hajar shekarchizadeh 1. research center for caries prevention, community oral health department, school of dentistry, tehran university of medical sciences , tehran, iran ; 2. dept. of oral public health, university of helsinki , helsinki, finland. mohammad r khami 2. dept. of oral public health, university of helsinki , helsinki, finland ; 3. dental research center, community oral health department, school of dentistry, tehran university of medical sciences , tehran, iran. simin z mohebbi 1. research center for caries prevention, community oral health department, school of dentistry, tehran university of medical sciences , tehran, iran ; 2. dept. of oral public health, university of helsinki , helsinki, finland. hamed ekhtiari 4. translational neuroscience program, institute for cognitive science studies , iran ; 5. neurocognitive laboratory, iranian national center for addiction studies, tehran university of medical sciences , tehran, iran. jorma i virtanen 6. dept. of community dentistry, university of oulu , oulu, finland ; 7. dept. of public health, university of helsinki , helsinki, finland.

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