1. Department of Prosthodontics, Gerodontology and Oral Rehabilitation Osaka University Graduate School of Dentistry Osaka Japan
2. Department of Clinical Thanatology and Geriatric Behavioral Science Osaka University Graduate School of Human Sciences Osaka Japan
3. Department of Health Science Osaka University Graduate School of Medicine Osaka Japan
4. Research Team for Human Care Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology Tokyo Japan
5. Department of Geriatric and General Medicine Osaka University Graduate School of Medicine Osaka Japan
6. Adelaide Dental School, Faculty of Health and Medical Sciences The University of Adelaide Adelaide South Australia Australia