1. Laboratory of Stem Cell Therapy, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Rehabilitation Medicine, Hallym University Medical Center, Seoul, Korea.
3. Department of Neurosurgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Rehabilitation Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Neurosurgery, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.