1. Department of Pulmonary and Critical Care Medicine, Asan Medical Center University of Ulsan College of Medicine Seoul Republic of Korea
2. Department of Pulmonary and Critical Care Medicine Chungnam National University Hospital, Chungnam National University School of Medicine Daejeon Republic of Korea
3. Department of Radiology, Asan Medical Center University of Ulsan College of Medicine Seoul Republic of Korea
4. Department of Pathology, Asan Medical Center University of Ulsan College of Medicine Seoul Republic of Korea
5. Division of Pulmonology, Department of Internal Medicine Inje University College of Medicine, Haeundae Paik Hospital Busan Republic of Korea