1. Department of Neurosurgery Graduate School of Medical Sciences Kyushu University Fukuoka Japan
2. Department of Neurosurgery Graduate School of Medicine Osaka University Suita Japan
3. Department of Clinical Radiology Graduate School of Medical Sciences Kyushu University Fukuoka Japan
4. Department of Neurosurgery Graduate School of Medical and Dental Sciences Kagoshima University Kagoshima Japan
5. Department of Neuropathology Graduate School of Medical Sciences Kyushu University Fukuoka Japan