1. Department of Rehabilitation Medicine, International University of Health and Welfare Ichikawa Hospital, Ichikawa, Chiba, Japan
2. Department of Rehabilitation Medicine, International University of Health and Welfare School of Medicine, Narita, Chiba, Japan
3. Department of Hepato-Biliary-Pancreatic Gastrointestinal Surgery, International University of Health and Welfare School of Medicine, Narita, Chiba, Japan
4. Department of Physical Therapy, Faculty of Health Science, International University of Health and Welfare, Otawara, Tochigi, Japan