1. Department of Radiology, Asan Foundation, GangNeung Asan Hospital, University of Ulsan College of Medicine, Gangneung 210-711, Korea.
2. Department of Thoracic and Cardiovascular Surgery, Asan Foundation, GangNeung Asan Hospital, University of Ulsan College of Medicine, Gangneung 210-711, Korea.
3. Department of General Surgery, Asan Foundation, GangNeung Asan Hospital, University of Ulsan College of Medicine, Gangneung 210-711, Korea.