1. Department of Neurosurgery, Shimane Prefectural Central Hospital
2. Department of Neurology, Hospital Bureau of Shimane Prefecture
3. Department of Neurosurgery, Araki Neurosurgical Hospital
4. Department of Neurosurgery, Graduate School of Biomedical and Health Sciences, Hiroshima University
5. Department of Neurosurgery, Chugoku Rosai Hospital
6. Department of Neurosurgery, Shimane University Faculty of Medicine
7. Department of Clinical Epidemiology, School of Public Health, Graduate School of Medicine, Kyoto University
8. Department of Health Informatics, School of Public Health, Graduate School of Medicine, Kyoto University
9. Department of Neurosurgery, Kochi Medical School, Kochi University
10. Department of Surgical Neurology, Akita Cerebrospinal and Cardiovascular Center
11. Department of Neurosurgery, Hirosaki University Graduate School