1. Department of Pediatrics, University of Tokyo, Tokyo, Japan
2. Division of Cardiology, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD
3. Division of Cardiology, Department of Medicine, Medical University of South Carolina, Charleston, SC
4. Department of Pediatric Cardiology, Saitama Medical Center, Saitama Medical University, Saitama, Japan
5. Department of Pediatrics and Pediatric Cardiology, Kitasato University, Sagamihara, Kanagawa, Japan