[1] Univ Tsukuba, Div Clin Med, Dept Neurol, Fac Med, 1-1-1 Tennoudai, Tsukuba, Ibaraki 3058575, Japan
[2] Niigata Univ, Brain Res Inst, Dept Mol Genet, 1-757 Asahimachi, Niigata 9518585, Japan
[3] Niigata Univ, Brain Res Inst, Dept Neurol, 1-757 Asahimachi, Niigata 9518585, Japan