1. Department of Neurosurgery, Kyoto University Medical School
2. Department of Neurosurgery, Kobe City General Hospital
3. Department of Neurosurgery, Kitano Hospital
4. Department of Neurosurgery, Osaka Red Cross Hospital
5. Department of Neurosurgery, Kurashiki Central Hospital
6. Department of Neurosurgery, Shinko Hospital
7. Department of Neurosurgery, Maizuru Municipal Hospital
8. Department of Neurosurgery, Hyogo Prefectural Tsukaguchi Hospital