1. Cardiovascular Center; Showa University Northern Yokohama Hospital; Yokohama Japan
2. Division of Pediatric Cardiology, Department of Pediatrics; Okayama University; Okayama Japan
3. Department of Pediatric Cardiology; Saitama Medical University International Medical Center; Hidaka Japan
4. Department of Cardiology; Shizuoka Children's Hospital; Shizuoka Japan
5. Department of Pediatric Cardiology; National Cerebral and Cardiovascular Center; Osaka Japan
6. Department of Pediatric Cardiology; Tokyo Women's Medical University; Tokyo Japan