1. Department of Rehabilitation, National Center for Global Health and Medicine, Tokyo, Japan;
2. Department of Rehabilitation Medicine, Keio University School of Medicine, Tokyo, Japan;
3. Department of Neuroscience, University of Copenhagen, Copenhagen, Denmark;
4. JSPS Overseas Research Fellow, Japan Society for the Promotion of Science, Tokyo, Japan;
5. Department of Physical Therapy, Yamagata Prefectural University of Health Sciences, Yamagata, Japan;
6. Department of Rehabilitation, National Hospital Organization Tokyo National Hospital, Tokyo, Japan