1. Departments of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro Seodaemun-gu, Seoul 03722, Korea
2. Pediatric Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro Seodaemun-gu, Seoul 03722, Korea
3. Department of Pediatrics, Seoul National University Children’s Hospital, 101 Daehak-ro Jongno-gu, Seoul, 03080 Korea
4. Department of Pediatrics, Sejong General Hospital, 489-28 Hohyun-ro, Bucheon, Gyeonggi-do, 14754 Korea