1. Department of Pediatrics and Child Health, Kurume University School of Medicine, Fukuoka 830-0011, Japan
2. Department of Pediatrics, Keio University, Tokyo 160-8582, Japan
3. Department of Pediatrics, Hiroshima University, Hiroshima 734-8553, Japan
4. Department of Pediatrics, Shimane University, Shimane 693-0021, Japan
5. Department of Pediatrics, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
6. Department of Pediatrics, Niigata University Medical & Dental Hospital, Niigata 951-8122, Japan
7. Department of Pediatrics, Hokkaido University, Hokkaido 060-8638, Japan
8. Department of Pediatrics, Osaka City University, Osaka 545-8585, Japan
9. Department of Pediatrics, Yamagata University, Yamagata 990-9585, Japan
10. Department of Pediatrics, Tohoku University, Miyagi 980-8575, Japan
11. Department of Pediatrics, Teikyo University Chiba Medical Center, Chiba 299-0111, Japan
12. Department of Pediatrics, Jichi Medical University, Tochigi 329-0498, Japan