1. Section of Preventive and Public Health Dentistry, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
2. OBT Research Center, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
3. Department of Epidemiology and Public Health, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
4. Center for Cohort Studies, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan