1. Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center , Seoul, South Korea
2. Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine , Seoul, South Korea
3. Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine , Seoul, South Korea
4. Department of Internal Medicine, Division of Pulmonology and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine , Seoul, South Korea