1. Department of Internal Medicine, Seonam University College of Medicine, Gwangju, Korea
2. Lung and Esophageal Cancer Clinic, Chonnam National University Hwasun Hospital, Jeonnam, Korea and Department of Internal Medicine, Chonnam National University Hwasun Hospital, Jeonnam, Korea
3. Lung and Esophageal Cancer Clinic, Chonnam National University Hwasun Hospital, Jeonnam, Korea and Department of Pathology, Chonnam National University Hwasun Hospital, Jeonnam, Korea
4. Lung and Esophageal Cancer Clinic, Chonnam National University Hwasun Hospital, Jeonnam, Korea and Department of Radiology, Chonnam National University Hwasun Hospital, Jeonnam, Korea
5. Lung and Esophageal Cancer Clinic, Chonnam National University Hwasun Hospital, Jeonnam, Korea and Thoracic and Cardiovascular Surgery, Chonnam National University Hwasun Hospital, Jeonnam, Korea