[1] Department of Neurosurgery, Graduate School of Medicine, Osaka University, 2-2, Yamadaoka, Suita,565-0871, Japan
[2] Tokuyukai Rehabilitation Clinic, 2-24-18, Shinsenri-nishimachi, Toyonaka,560-0083, Japan
[3] Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama-cho, Toyonaka,560-8531, Japan