1. Department of Geriatric Dentistry Showa University School of Dentistry Tokyo Japan
2. Department of Dysphagia Rehabilitation Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Tokyo Japan
3. Department of Gerodontology and Oral Rehabilitation Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Tokyo Japan
4. Department of Oral Health Sciences for Community Welfare Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Tokyo Japan
5. Department of Nutrition Service Medical Hospital Tokyo Medical and Dental University Tokyo Japan
6. Department of Medical Education Research and Development Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Tokyo Japan