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