1. Department of Neurosurgery; Seoul National University College of Medicine; Seoul Korea
2. Cancer Research Institute, Seoul National University College of Medicine; Seoul Korea
3. Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine; Seoul Korea
4. Department of Neurosurgery; Mayo Clinic; Rochester Minnesota
5. Stem Cell & Regenerative Medicine Center, Research Institute for Future Medicine; Samsung Medical Center; Seoul Korea
6. Biomedical Research Institute, Medipost Co., Ltd.; Seoul Korea