1. Department of Neurosurgery, Osaka University
2. Department of Neurosurgery, Teikyo University
3. Department of Neurosurgery, University of Tokyo
4. Department of Neurosurgery, Kyoto University
5. Department of Neurosurgery, Kuwana Hospital
6. Department of Neurosurgery, Brain Research Institute, Niigata University
7. Department of Neurosurgery, National Cancer Center