1. Department of Diagnostic Radiology, Medical Research Center, Yonsei University College of Medicine, Seoul, Korea.
2. Research Institute of Radiological Science, Medical Research Center, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Thoracic Surgery, Medical Research Center, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Pulmonary Division, Medical Research Center, Yonsei University College of Medicine, Seoul, Korea.
5. Laboratory Animal Medicine, Medical Research Center, Yonsei University College of Medicine, Seoul, Korea.