1. Department of Radiology, Soonchunhyang University Bucheon Hospital, Bucheon, Gyeonggi-do 420-767, Korea.
2. Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Gyeonggi-do 420-767, Korea.
3. Department of Pathology, Soonchunhyang University Bucheon Hospital, Bucheon, Gyeonggi-do 420-767, Korea.
4. Department of Thoracic Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Gyeonggi-do 420-767, Korea.
5. Department of Anesthesiology and Pain Medicine, Asan Medical Center, Ulsan University College of Medicine, Seoul 138-736, Korea.