1. Departments of Cerebrovascular Medicine, Teine Keijinkai Hospital, Japan
2. Departments of Neurosurgery, Teine Keijinkai Hospital, Japan
3. Departments of Ophthalmology, Teine Keijinkai Hospital, Japan
4. Departments of Pathology, Teine Keijinkai Hospital, Japan
5. Department of Cancer Pathology, Faculty of Medicine, Hokkaido University, Japan