[1] Jikei Univ, Sch Med, Pediat, Minato Ku, Tokyo, Japan
[2] Natl Ctr Child Hlth & Dev, Clin Trials, Setagaya Ku, Tokyo, Japan
[3] Osaka Med Coll, Pediat, Takatsuki, Osaka 569, Japan
[4] Tokyo Metropolitan Childrens Med Ctr, Clin Res Support Ctr, Fuchu, Tokyo, Japan
[5] Tokyo Metropolitan Childrens Med Ctr, Pediat, Fuchu, Tokyo, Japan
[6] Nihon Univ, Sch Med, Pediat & Child Hlth, Chiyoda Ku, Tokyo 102, Japan
[7] Tokyo Womens Med Univ, Pediat Nephrol, Shinjuku Ku, Tokyo, Japan