1. Department of Internal Medicine; Asan Medical Center, University of Ulsan College of Medicine; Seoul South Korea
2. Department of Pulmonary and Critical Care Medicine; Asan Medical Center, University of Ulsan College of Medicine; Seoul South Korea
3. Department of Oncology; Asan Medical Center, University of Ulsan College of Medicine; Seoul South Korea
4. Department of Radiation Oncology; Asan Medical Center, University of Ulsan College of Medicine; Seoul South Korea