1. Department of Pediatrics, Mie University School of Medicine, Mie, Japan
2. Department of Pediatrics, Toho University Omori Medical Center, Tokyo, Japan
3. Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
4. Department of Pediatrics, Osaka University School of Medicine, Osaka, Japan
5. Department of Pediatric Cardiology, National Cerebral and Cardiovascular Center, Osaka, Japan
6. Department of Pediatrics, Toyama University School of Medicine, Toyama, Japan
7. Department of Cardiology, Shizuoka Children’s Hospital, Shizuoka, Japan
8. Department of Pediatric Cardiology, Tokyo Women’s Medical University, Tokyo, Japan
9. Department of Pediatrics, Tokyo Medical and Dental University, Tokyo, Japan
10. Department of Pediatric Cardiology, Fukuoka Children’s Hospital, Fukuoka, Japan; and
11. Department of Pediatric Cardiology, Social Insurance Chukyo Hospital, Aichi, Japan