[1] Univ Miyazaki Hosp, Fac Med, Kiyotake, Miyazaki 8891692, Japan
[2] Miyazaki Univ, Fac Med, Div Pediat, Dept Reprod & Dev Med, Miyazaki, Japan
[3] Hiroshima Univ, Fac Educ, Hiroshima, Japan
[4] St Lukes Int Hosp, Dept Pediat, Tokyo, Japan
[5] Osaka Univ, Grad Sch Human Sci, Ctr Study Commun Design, Osaka, Japan
[6] Osaka Univ, Grad Sch Med, Osaka, Japan
[7] Waseda Univ, Fac Human Sci, Saitama, Japan