1. Department of Radiology, Korea University Medical Center, Anam Hospital, Seoul, Korea.
2. Department of Thoracic and Cardiovascular Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Thoracic and Cardiovascular Surgery, Ajou University School of Medicine, Suwon, Korea.