1. From the Department of Pediatrics (J.I.S.), Yonsei University College of Medicine, Seoul, Korea
2. Department of Medicine, Division of Cardiology, Emory University, Atlanta, Georgia (J.I.S., Y.Y.).
3. Cardiology Division, Severance Cardiovascular Hospital (J.O., D.C.), Yonsei University College of Medicine, Seoul, Korea
4. Department of Preventive Medicine (H.C.K.), Yonsei University College of Medicine, Seoul, Korea
5. Severance Biomedical Science Institute (Y.Y.), Yonsei University College of Medicine, Seoul, Korea