[1] Natl Inst Infect Dis, Ctr Surveillance Immunizat & Epidemiol Res, Tokyo, Japan
[2] Natl Inst Infect Dis, Dept Qual Assurance Radiat Safety & Informat Syst, Tokyo, Japan
[3] Saitama Childrens Med Ctr, Dept Neurol, Saitama, Japan
[4] Tokyo Med & Dent Univ TMDU, Grad Sch Med & Dent Sci, Dept Pediat & Dev Biol, Tokyo, Japan
[5] Kanagawa Prefectural Inst Publ Hlth, Kanagawa, Japan
[6] Natl Inst Infect Dis, Ctr Surveillance Immunizat & Epidemiol Res, Toyama 1-23-1,Shinjuku Ku, Tokyo 1628640, Japan