3 Department of Rehabilitation, International University of Health and Welfare Ichikawa Hospital, Ichikawa, Chiba, Japan. 4 Department of Rehabilitation, International University of Health and Welfare Shioya Hospital, Yaita, Tochigi, Japan. 5 Faculty of Medicine, School of Medicine, International University of Health and Welfare, Narita, Chiba, Japan. 6 Department of Occupational