[1] Hokkaido Univ, Grad Sch Med, Dept Neurol, Sapporo, Hokkaido, Japan
[2] Wakkanai City Hosp, Rehabil Ctr, Wakkanai, Hokkaido, Japan
[3] Wakkanai City Hosp, Dept Psychiat, Wakkanai, Hokkaido, Japan
[4] Wakkanai City Hosp, Dept Internal Med, Wakkanai, Hokkaido, Japan