1. Division of Preventive DentistryDepartment of Oral Health ScienceNiigata University Graduate School of Medical and Dental Sciences Niigata Japan
2. Division of Community Oral Health DevelopmentKyushu Dental University Kitakyushu Japan
3. Graduate School of Human SciencesOsaka University Osaka Japan
4. Center for Southeast Asian StudiesKyoto University Kyoto Japan
5. Department of Health and Sports ScienceFaculty of Health Science and TechnologyKawasaki University of Medical Welfare Kurashiki Japan