1. Department of Neurosurgery, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
2. Department of Neurosurgery, Hokkaido University Graduate School of Medicine
3. Department of Neurosurgery, Kindai University Faculty of Medicine
4. Department of Neurosurgery, National Cerebral and Cardiovascular Center
5. Department of Neurosurgery, Iwate Medical University
6. Department of Neurosurgery, Gifu University School of Medicine
7. Department of Neurosurgery, Tohoku University Graduate School of Medicine
8. Department of Neurosurgery, Kyoto University Graduate School of Medicine