1. Department of Orthopedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
2. Department of Energy and Materials, Faculty of Science and Engineering, Kindai University, Osaka, Japan.
3. Department of Orthopedic Surgery, Spinal Injuries Center, Iizuka, Japan.
4. Department of Orthopedic Surgery, Graduate School of Medical Sciences, Osaka University, Osaka, Japan.
5. Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.