1. Department of Pediatrics, Seoul National University Children’s Hospital, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Pediatrics, Bucheon Sejong Hospital, Bucheon, Korea.
3. Department of Thoracic and Cardiovascular Surgery, Bucheon Sejong Hospital, Bucheon, Korea.
4. Division of Pediatric Cardiac Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Pediatrics, Pusan National University Children’s Hospital, Pusan National University School of Medicine, Yangsan, Korea.
6. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
7. Department of Pediatrics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
8. Department of Pediatrics, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
9. Department of Pediatrics, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
10. Department of Pediatric Cardiology, Gachon University Gil Medical Center, Incheon, Korea.
11. Department of Pediatrics, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
12. Department of Pediatrics, Kyungbook National University School of Medicine, Daegu, Korea.
13. Department of Pediatrics, Dong-A University Hospital, Pusan, Korea.
14. Department of Statistics and Actuarial Science, Soongsil University, Seoul, Korea.