[1] Univ Tokushima, Grad Sch, Dept Clin Neurosci, Inst Hlth Biosci, Tokushima 770, Japan
[2] Univ Tokushima, Grad Sch, Dept Med Imaging, Inst Hlth Biosci, Tokushima 770, Japan
[3] Kamagaya Gen Hosp, Dept Neurol, Kamagaya Chiba Med Ctr Intractable Neurol Dis KC, Kamagaya, Japan
[4] Iwate Med Univ, Adv Med Sci Ctr, Morioka, Iwate 020, Japan