1 Department of Pulmonary and Critical Care Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, South Korea.
2 Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea; Department of Medical Humanities, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
3 Department of Medical Statistics, College of Medicine, Catholic University of Korea, Seoul, South Korea.
4 Department of Family Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea; Department of Clinical Research Design and Evaluation, Samsung Advanced Institute for Health Science and Technology, Sungkyunkwan University, Seoul, South Korea. Electronic address: dwshin.md@gmail.com.
5 Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.