[1] Tohoku Univ, Grad Sch Med, Neurosurg, Sendai, Miyagi, Japan
[2] Tohoku Univ, Grad Sch Med, Elect Neurophysiol, Sendai, Miyagi, Japan
[3] Tohoku Univ, Grad Sch Med, Epileptol, Sendai, Miyagi, Japan
[4] Natl Ctr Hosp Neurol & Psychiat, Neurosurg, Kodaira, Tokyo, Japan
[5] Tohoku Univ, Grad Sch Med, Behav Neurol & Cognit Neurosci, Sendai, Miyagi, Japan