1. Department of Pulmonary and Critical Care Medicine, Chosun University Hospital, Gwangju, Korea.
2. Department of Laboratory Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Rheumatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Pulmonary and Critical Care Medicine, Center for Pulmonary Hypertension and Venous Thrombosis, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.