[1] Shinshu Univ, Dept Pediat, Sch Med, Matsumoto, Nagano, Japan
[2] Shinshu Univ, Dept Dermatol, Sch Med, Matsumoto, Nagano, Japan
[3] Shinshu Univ, Dept Lab Med, Sch Med, Matsumoto, Nagano, Japan
[4] Shinshu Univ, Dept Pathol, Sch Med, Matsumoto, Nagano, Japan
[5] Shinshu Univ, Grad Sch Med, Dept Infect & Host Def, Matsumoto, Nagano, Japan