1. Department of Pediatrics, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
2. Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Korea.
3. Graduate School of Public Health, Hanyang University, Seoul, Korea.
4. Department of Pediatrics, Seoul National University Children’s Hospital and Seoul National University College of Medicine, Seoul, Korea.
5. Division of Cardiology, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
6. Division of Cardiology, Department of Internal Medicine, Wonkwang University Sanbon Hospital, Gunpo, Korea.