[1] Kobe City Med Ctr Gen Hosp, Comprehens Stroke Ctr, Kobe, Hyogo, Japan
[2] Osaka Univ, Grad Sch Med, Stroke Ctr, Osaka, Japan
[3] Natl Cerebral & Cardiovasc Ctr, Div Stroke Care Unit, Suita, Osaka, Japan
[4] Natl Hosp Org Osaka, Dept Vasc Neurol, Minami Med Ctr, Osaka, Japan
[5] Natl Hosp Org Osaka Med Ctr, Div Stroke Med, Osaka, Japan
[6] Hyogo Coll Med, Dept Clin Epidemiol, Nishinomiya, Hyogo, Japan
[7] Shinko Mem Hosp, Dept Neurosurg, Kobe, Hyogo, Japan
[8] Ehime Univ, Dept Neurosurg, Sch Med, Matsuyama, Ehime, Japan
[9] Amagasaki Gen Med Ctr, Dept Neurosurg, Amagasaki, Hyogo, Japan
[10] Kyoto Univ, Grad Sch Med, Dept Neurosurg, Kyoto, Japan
[11] Osaka Gen Med Ctr, Dept Neurol, Osaka, Japan
[12] Tokyo Womens Med Univ, Dept Neurosurg, Tokyo, Japan
[13] Hyogo Coll Med, Dept Neurosurg, Nishinomiya, Hyogo, Japan
[14] St Lukes Int Hosp, Dept Neurosurg & Neurovasc Therapy, Tokyo, Japan
[15] Kyushu Univ, Grad Sch Med Sci, Dept Neurosurg, Fukuoka, Fukuoka, Japan
[16] Natl Hosp Org Osaka Med Ctr, Dept Neurosurg, Osaka, Japan