1. Department of Internal Medicine, Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Republic of Korea
2. Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
3. Medical Research Collaborating Center, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
4. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
5. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
6. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea