1. Division of Preventive Dentistry, Department of Oral Health Science Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
2. Division of Community Oral Health Development Kyushu Dental University Kitakyushu Japan
3. Center for Southeast Asian Studies Kyoto University Kyoto Japan
4. Division of Oral Science for Health Promotion, Department of Oral Health and Welfare Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
5. Department of Field Medicine, School of Public Health Kyoto University Kyoto Japan
6. Department of Preventive and Restorative Dental Sciences University of California San Francisco San Francisco California USA