1. Division of Pediatrics, Department of Homeostatic Regulation and Development, Niigata University Graduate School of Medicine and Dental Science, Niigata, Japan
2. Department of Pediatrics, Hokkaido University School of Medicine, Hokkaido, Japan
3. Department of Pediatrics, Tsuchiura Kyodo General Hospital, Ibaraki, Japan
4. Department of Pediatrics, Sapporo Medical University School of Medicine, Hokkaido, Japan
5. Department of Pediatrics, Shinshu University School of Medicine, Nagano, Japan
6. Department of Pediatrics, Tohoku University School of Medicine, Miyagi, Japan
7. Department of Pediatrics, Dokkyo Medical University School of Medicine, Tochigi, Japan
8. Department of Pediatrics, Gunma University Graduate School of Medicine, Gunma, Japan
9. Department of Pediatrics, Akita University Graduate School of Medicine, Akita, Japan
10. Department of Pediatrics, Asahikawa Medical University, Hokkaido, Japan
11. Department of Pediatrics, Tokyo Medical and Dental University, Tokyo, Japan
12. Department of Pediatrics, Jichi Medical University, Tochigi, Japan