1. Department of Neurosurgery, Hokkaido University Graduate School of Medicine
2. Department of Neurosurgery, Tohoku University Graduate School of Medicine
3. Department of Neurosurgery, University of Toyama School of Medicine
4. Department of Neurosurgery, Kindai University Faculty of Medicine
5. Department of Neurosurgery, Kohnan Hospital
6. Department of Neurosurgery, Iwate Medical University School of Medicine
7. Department of Neurosurgery, Kyoto University Graduate School of Medicine