1. Division of Oral Reconstruction and Rehabilitation Kyushu Dental University Kitakyushu City Japan
2. Tokyo Metropolitan Institute of Gerontology Itabashi‐Ku Japan
3. Graduate School of Human Sciences Osaka University Suita City Japan
4. Division of Community Oral Health Development Kyushu Dental University Kitakyushu City Japan
5. Center for Southeast Asian Studies Kyoto University Kyoto City Japan
6. Department of Health and Sports Science, Faculty of Health Science and Technology Kawasaki University of Medical Welfare Kitakyushu City Japan