1. Division of Medical Oncology, Yonsei Cancer Center, Yonsei University College of Medicine Seoul, Seoul, The Republic of Korea;
2. Department of Internal Medicine, Seoul National University Hospital, Seoul, The Republic of Korea;
3. Division of Hematology/Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, The Republic of Korea;
4. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoungnam, The Republic of Korea;
5. Department of Internal Medicine, Kyungpook National University Hospital, Daegu, The Republic of Korea;
6. Department of Internal Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, The Republic of Korea;
7. Department of Internal Medicine, Korea University Guro Hospital, Seoul, The Republic of Korea;
8. Department of Internal Medicine, Korea Cancer Center Hospital, Seoul, The Republic of Korea;
9. Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang, The Republic of Korea;
10. Lung Cancer Clinic, Hwasun Hospital, Chonnam National University Medical School, Jeonnam, The Republic of Korea;
11. Department of Internal Medicine, Yeouido St. Mary’s Hospital, The Catholic University of Korea, Seoul, The Republic of Korea;
12. Center for Lung Cancer, National Cancer Center, Goyang, The Republic of Korea;
13. Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, The Republic of Korea