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