[1] Tokushima Univ, Dept Neurol, Grad Sch Biomed Sci, Tokushima, Japan
[2] Brain Attack Ctr Ota Mem Hosp, Dept Neurol, Hiroshima, Japan
[3] Tokushima Prefectural Cent Hosp, Dept Neurol, Tokushima, Japan
[4] Tokushima Univ, Dept Neurosurg, Grad Sch Biomed Sci, Tokushima, Japan
[5] Tokushima Univ Hosp, Div Pathol, Tokushima, Japan
[6] Tokushima Univ, Dept Radiol, Grad Sch Biomed Sci, Tokushima, Japan