1. Division of Epidemiology, School of Public Health Shizuoka Graduate University of Public Health Shizuoka Shizuoka Japan
2. Department of Health Informatics, Graduate School of Medicine & School of Public Health Kyoto University Yoshidakonoe‐cho, Sakyou‐ku Kyoto Japan
3. Dysphagia Rehabilitation, Department of Gerontology and Gerodontology, Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Bunkyo‐ku Tokyo Japan
4. Tama Oral Rehabilitation Clinic The Nippon Dental University Koganei Tokyo Japan