1. Center for Lung Cancer, National Cancer Center Hospital, Goyang, South Korea
2. BK21 Graduate Program, Department of Biomedical Sciences, Korea University College of Medicine, Seoul, South Korea
3. Department of Laboratory Medicine, Korea University Guro Hospital, Seoul, South Korea
4. Department of Thoracic and Cardiovascular Surgery, Korea University Guro Hospital, Seoul, South Korea
5. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Korea University Guro Hospital, Seoul, South Korea
6. Department of Medical Science, Soonchunhyang University, Asan, South Korea