1. Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea.
3. Department of Thoracic and Cardiovascular Surgery, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
4. Center for Lung Cancer, National Cancer Center, Goyang, Korea.
5. Division of Pulmonology, Department of Internal Medicine, Chungnam National University, Daejeon, Korea.
6. Department of Medicine, Samsung Medical Center, Sungkyunkwan University, Seoul, Korea.
7. Division of Pulmonology, Department of Internal Medicine, The Cancer Research Institute, College of Medicine, The Catholic University of Korea, Seoul, Korea.
8. Department of Cardiothoracic Surgery, Pusan National University Hospital, Busan, Korea.
9. Department of Pulmonary Medicine, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea.
10. Cancer Registration and Statistics Branch, National Cancer Center, Goyang, Korea.
11. Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.