1. Department of Dysphagia Rehabilitation Division of Gerontology and Gerodontology Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Tokyo Japan
2. Department of Critical Care Medicine and Dentistry Division of Medically Compromised Geriatric Dentistry Graduate School of Dentistry Kanagawa Dental University Yokosuka Japan
3. Department of Gerodontology and Oral Rehabilitation Division of Gerontology and Gerodontology Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Tokyo Japan