1. Department of Neurosurgery, Ehime University Graduate School of Medicine, Toon, Ehime 791-0295, Japan
2. Department of Neurosurgery, Washoukai Sadamoto Hospital, Matsuyama, Ehime 790-0052, Japan
3. Department of Neurosurgery, Ehime Prefectural Central Hospital, Matsuyama, Ehime 790-0024, Japan
4. Department of Molecular and Cellular Physiology, Ehime University Graduate School of Medicine, Toon, Ehime 791-0295, Japan
5. Division of Pathophysiology, Faculty of Pharmaceutical Sciences, Hokuriku University, Kanazawa, Ishikawa 920-1180, Japan
6. Division of Diagnostic Pathology, Ehime University Hospital, Toon, Ehime 791-0295, Japan