1. Department of Radiology, Chonnam National University Medical School, Gwangju, Korea.
2. Lung and Esophageal Cancer Clinic, Chonnam National University, Hwasun Hospital, Hwasun, Korea.
3. Department of Thoracic and Cardiovascular Surgery, Chonnam National University Medical School, Gwangju, Korea.
4. Department of Pathology, Chonnam National University Medical School, Gwangju, Korea.