[1] St Marianna Univ, Sch Med, Dept Pediat, Kawasaki, Kanagawa, Japan
[2] Yokohama City Seibu Hosp, Yokohama, Kanagawa, Japan
[3] St Marianna Univ, Dept Clin Lab, Sch Med Hosp, Kawasaki, Kanagawa, Japan
[4] Daito Bunka Univ, Fac Hlth Sci, Tokyo, Japan
[5] St Marianna Univ, Dept Med Stat, Sch Med, Kawasaki, Kanagawa, Japan