1. Department of Neurosurgery, Seoul National University College of Medicine, Seoul 03082, Korea
2. Cancer Research Institute, Seoul National University College of Medicine, Seoul 03082, Korea
3. Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul 03082, Korea
4. Stem Cell & Regenerative Medicine Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul 06351, Korea
5. Biomedical Research Institute, MEDIPOST Co., Ltd, Seoul 13494, Korea