1. Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan
2. Department of Physiology, Keio University School of Medicine, Tokyo, Japan
3. Regenerative & Cellular Medicine Office, Sumitomo Dainippon Pharma Co., Ltd., Kobe, Japan
4. Department of Rehabilitation Medicine, Keio University School of Medicine, Tokyo, Japan
5. Department of Orthopaedic Surgery, National Hospital Organization Murayama Medical Center, Tokyo, Japan
6. Department of Biomedical Research and Innovation, Institute for Clinical Research and Department of Neurosurgery, Osaka National Hospital, National Hospital Organization, Osaka, Japan
7. Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto, Japan