1. Lung and Esophageal Cancer Clinic, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea.
2. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
3. Department of Thoracic and Cardiovascular Surgery, Chonnam National University Medical School, Gwangju, Korea.
4. Department of Radiation Oncology, Chonnam National University Medical School, Gwangju, Korea.
5. Department of Pathology, Chonnam National University Medical School, Gwangju, Korea.
6. Department of Radiology, Chonnam National University Medical School, Gwangju, Korea.
7. Department of Nuclear Medicine, Chonnam National University Medical School, Gwangju, Korea.