1. Department of International and Community Oral Health, Tohoku University Graduate School of Dentistry, Sendai, Japan
2. Center for Well-being and Society, Nihon Fukushi University, Mihama, Japan
3. Department of Epidemiology, Fukushima Medical University School of Medicine, Fukushima, Japan
4. Department of Social Medicine, Public Health, Graduate School of Medicine, Osaka University, Suita, Japan
5. Department of Nursing, Faculty of Nursing, Kinjo Gakuin University, Nagoya, Japan
6. Department of Social Preventive Medical Sciences, Center for Preventive Medical Sciences, Chiba University, Chiba, Japan
7. Department of Oral Health Promotion, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan