1. Division of Advanced Prosthetic Dentistry Graduate School of Dentistry Tohoku University Sendai Japan
2. Graduate School of Biomedical Engineering Tohoku University Sendai Japan
3. Department of Orthopaedic Surgery Graduate School of Medicine Tohoku University Sendai Japan
4. Department of Oral Disease Research National Center for Geriatrics and Gerontology Obu Japan
5. Department of Nursing Tohoku Fukushi University Sendai Japan