1. Department of General Medicine and Primary Care; Tokyo Medical University Hospital; Hiroshima Japan
2. Division of Rehabilitation for Speech and Swallowing Disorders; Nippon Dental University Tama Oral Rehabilitation Clinic; Hiroshima Japan
3. Division of Clinical Oral Rehabilitation; The Nippon Dental University Graduate School of Life Dentistry at Tokyo; Hiroshima Japan
4. Dental Department; Hiroshima City Rehabilitation Hospital; Hiroshima Japan
5. Section of Preventive and Public Health Dentistry; Division of Oral Health, Growth and Development; Faculty of Dental Science; Kyushu University; Fukuoka Japan
6. Department of General Medicine; Tokyo Medical University; Tokyo Japan