1. Gerodontology, Department of Oral Health Science, Faculty of Dental Medicine, Hokkaido University, Hokkaido, Japan
2. Niigata University Medical and Dental Hospital, Niigata, Japan
3. Department of Oral Medicine and Hospital Dentistry, Tokyo Dental College, Chiba, Japan
4. Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
5. Department of Oral Rehabilitation Osaka Dental University Hospital, Osaka, Japan
6. Inohara Dental and Rehabilitation Clinic, Hiroshima, Japan
7. Ota Memorial Hospital, Hiroshima, Japan
8. Rehabilitation Clinic for Speech and Swallowing Disorders, The Nippon Dental University Hospital, Tokyo, Japan
9. Department of Oral and Maxillofacial Prosthodontics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
10. Department of Geriatric Dentistry, Showa University School of Dentistry, Tokyo, Japan
11. Tohoku Fukushi University, Miyagi, Japan
12. Swallowing Disorders Center, Fukuoka University Hospital, Fukuoka, Japan
13. Wakakusa-Tatsuma Rehabilitation Hospital, Osaka, Japan
14. The Nippon Dental University Tama Oral Rehabilitation Clinic, Tokyo, Japan
15. Department of Dentistry & Oral-Maxillofacial Surgery Fujita Health University, Aichi, Japan