1. Department of Medicine, Sungkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, Seoul, Korea.
2. Grown-Up Congenital Heart Disease (GUCH) Clinic, Cardiac and Vascular Center, Samsung Medical Center, Seoul, Korea.
3. Department of Pediatrics, Sungkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, Seoul, Korea.