[1] Natl Cerebral & Cardiovasc Ctr, Dept Cerebrovasc Med, Suita, Osaka 5658565, Japan
[2] Natl Cerebral & Cardiovasc Ctr, Dept Neurosurg, Suita, Osaka 5658565, Japan
[3] Kawasaki Med Sch, Dept Stroke Med, Kurashiki, Okayama, Japan
[4] Natl Hosp Org Kyushu Med Ctr, Clin Res Inst, Dept Cerebrovasc Med & Neurol, Fukuoka, Japan
[5] Nagoya Daini Red Cross Hosp, Dept Neurol, Nagoya, Aichi, Japan
[6] Saitama Med Univ, Saitama Int Med Ctr, Dept Neurol & Cerebrovasc Med, Hidaka, Japan
[7] Res Inst Brain & Blood Vessels, Dept Stroke Sci, Akita, Japan
[8] Tokai Univ, Dept Neurol, Isehara, Kanagawa, Japan
[9] Nakamura Mem Hosp, Dept Neurosurg, Sapporo, Hokkaido, Japan
[10] Ebara Hosp, Dept Neurol, Tokyo, Japan
[11] Tokyo Womens Med Univ, Dept Neurol, Tokyo, Japan
[12] Univ Tokushima, Dept Neurosurg, Tokushima 770, Japan
[13] Iwate Med Univ, Dept Neurosurg, Morioka, Iwate 020, Japan
[14] Hiroshima Univ, Dept Clin Neurosci & Therapeut, Hiroshima, Japan