1. Department of Pathology, College of Medicine, Pusan National University, Busan, Korea.
2. Department of Thoracic Surgery, College of Medicine, Pusan National University, Busan, Korea.
3. Department of Diagnostic Radiology, College of Medicine, Pusan National University, Busan, Korea.
4. Department of Pediatrics, College of Medicine, Pusan National University, Busan, Korea.