1. Departments of Neurosurgery Yonsei University College of Medicine, Seoul, Korea
2. Department of Microbiology University of Ulsan College of Medicine, Seoul, Korea
3. Department of Brain Research Institute, and Institute for Cancer Research Yonsei University College of Medicine, Seoul, Korea
4. Department of Pharmacology University of Pittsburgh Medical School, Pittsburgh, Pennsylvania
5. Department of Internal Medicine Yonsei University College of Medicine, Seoul, Korea