1. Department of Nephrology; Tokyo Metropolitan Children's Medical Center; Tokyo Japan
2. Clinical Research Support Center; Tokyo Metropolitan Children's Medical Center; Tokyo Japan
3. Department of Pediatrics; Shiga University of Medical Science; Shiga Japan
4. Department of Pediatric Nephrology; Toho University Faculty of Medicine; Tokyo Japan
5. Department of Pathology and Laboratory Medicine; Tokyo Metropolitan Children's Medical Center; Tokyo Japan
6. Division of Pathology; Tachikawa Hospital; Federation of National Public Service Personnel Mutual Aid Associations; Tokyo Japan