[1] Tokyo Metropolitan Inst Gerontol, Res Team Neuroimaging, Tokyo, Japan
[2] Tokyo Metropolitan Canc & Infect Dis Ctr Komagome, Dept Neurol, Tokyo, Japan
[3] Tokyo Metropolitan Canc & Infect Dis Ctr Komagome, Dept Med Oncol, Tokyo, Japan
[4] Natl Inst Infect Dis, Dept Virol 1, Tokyo, Japan