1 Department of Neurology, National Hospital Organization Sendai Nishitaga Hospital, Sendai, Miyagi, Japan.
2 Department of Neurology, National Hospital Organization Sendai Nishitaga Hospital, Sendai, Miyagi, Japan; Department of Aging Research and Geriatric Medicine, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Miyagi, Japan.
3 Department of Neurology, National Hospital Organization Sendai Nishitaga Hospital, Sendai, Miyagi, Japan; Department of Cognitive & Motor aging, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan. Electronic address: takeda.atsushi.nc@mail.hosp.go.jp.