1. Department of Pulmonology and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea;
2. Department of Preventive Medicine, Gachon University College of Medicine, Incheon, Korea;
3. Artificial Intelligence and Big-data Convergence Center, Gil Medical Center, Incheon, Korea;
4. Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea; and
5. Environmental Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea