1. School of Medicine; Gachon University; Incheon Korea
2. Department of Thoracic and Cardiovascular Surgery; Gachon University Gil Hospital; Incheon Korea
3. Department of Radiology; Gachon University Gil Hospital; Incheon Korea
4. Department of Internal Medicine; Gachon University Gil Hospital; Incheon Korea
5. Department of Emergency Medicine; Gachon University Gil Hospital; Incheon Korea