1. Department of Neurosurgery, National Center Hospital, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo;
2. Department of Clinical Epidemiology, Translational Medical Center, NCNP, Kodaira, Tokyo;
3. Department of Neurosurgery, Yokohama City University Hospital, Yokohama, Kanagawa;
4. Department of Child Neurology, National Center Hospital, NCNP, Kodaira, Tokyo;
5. Department of Neurosurgery, Shibukawa Medical Center, Shibukawa, Gunma; and
6. Epilepsy Centre Bethel Japan, Iwanuma, Miyagi, Japan