1. Unit for Respiratory System and Dementia in the Division of Internal Medicine, Katsuren Hospital, Itoman, Okinawa, Japan
2. Division of Rehabilitation, Katsuren Hospital, Itoman, Okinawa, Japan
3. Division of Psychiatry, Katsuren Hospital, Itoman, Okinawa, Japan
4. Unit for Nervous System and Dementia in the Division of Internal Medicine, Katsuren Hospital, Itoman, Okinawa, Japan