1. Department of Pulmonary and Critical Care Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea.
2. Department of Big Data, Health Insurance Review Assessment Service, Wonju, Korea.
3. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, Seoul, Korea.
4. Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Center for Pulmonary Hypertension and Venous Thrombosis, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.