1. Department of Physical Medicine and RehabilitationTohoku University graduate School of Medicine Sendai Japan
2. Department of Rehabilitation MedicineToho University Graduate School of Medicine Tokyo Japan
3. Department of Oral and Maxillofacial SurgeryDysphagia Rehabilitation Center, Southern Tohoku General Hospital Koriyama Japan
4. Department of Physical Medicine and RehabilitationTohoku University Graduate School of Biomedical Engineering Sendai Japan
5. Department of Geriatric MedicineKyorin University School of Medicine Tokyo Japan