1. Department of Nephrology, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan
2. Department of Pediatric Nephrology, Aichi Children's Health and Medical Center, Aichi, Japan
3. Department of Nephrology and Rheumatology, National Center for Child Health and Development, Tokyo, Japan
4. Department of Pediatric Nephrology, Shizuoka Children's Hospital, Shizuoka, Japan
5. Department of Pediatric Nephrology, Tokyo Women's Medical University, Tokyo, Japan
6. Department of Biostatistics, School of Public Health, The University of Tokyo, Tokyo, Japan
7. Department of Pediatric Nephrology, Toho University Omori Medical Center, Tokyo, Japan
8. Department of Nephrology, Hyogo Prefectural Children's Hospital, Hyogo, Japan
9. Department of Pediatrics, Wakayama Medical University, Wakayama, Japan
10. Department of Clinical Research, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan