1. Division of Cardiology, Heart Center, Gachon University Gil Hospital, Incheon, Korea.
2. Gachon Cardiovascular Research Institute, Gachon University Gil Hospital, Incheon, Korea.
3. Division of Pediatric Cardiology, Gachon University Gil Hospital, Incheon, Korea.
4. Division of Rheumatology, Gachon University Gil Hospital, Incheon, Korea.
5. Division of Pulmonology, Gachon University Gil Hospital, Incheon, Korea.