1. Department of Pediatrics, Kobe University Graduate School of Medicine, Hyogo, Japan;
2. Department of Pediatrics, Kakogawa Central City Hospital, Hyogo, Japan;
3. Department of Pediatrics, Wakayama Medical University, Wakayama, Japan;
4. Department of Pediatrics, Himeji Red-Cross Hospital, Hyogo, Japan;
5. Department of Pediatrics, Ryukyu University Graduate School of Medicine, Okinawa, Japan;
6. Department of Nephrology, Hyogo Prefectural Kobe Children’s Hospital, Hyogo, Japan;
7. Clinical Research Center, Wakayama Medical University, Wakayama, Japan