Shuichiro Fujinaga1, Daishi Hirano2. 1. Division of Nephrology, Saitama Children's Medical Center, 2100 Magome, Iwatsuki-ku, Saitama City, Saitama, 339 8551, Japan. f_shuich@d2.dion.ne.jp. 2. Department of Pediatrics, Jikei University School of Medicine, Saitama City, Japan.