1. Department of Neurosurgery, Shimane University School of Medicine
2. Department of Neurosurgery and Clinical Institute, Osaka National Hospital, National Hospital Organization
3. Department of Pediatric Neurosurgery, Osaka City General Hospital
4. Department of Neurosurgery, Juntendo University
5. Medical Department of Preventive Medicine/Biostatistics and Medical Decision Making, Nagoya University Graduate School of Medicine