1. Department of Thoracic and Cardiovascular Surgery, College of Medicine, Kangwon National University, Chuncheon, Korea.
2. Department of Thoracic and Cardiovascular Surgery, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
3. Department of Radiology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
4. Department of Thoracic and Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.