1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam‐Si, Korea
2. Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam‐Si, Korea
3. Department of Internal Medicine, Chung‐Ang University College of Medicine, Seoul, Korea
4. Department of Environmental Health and Institute of Health and Environment, Graduate School of Public Health, Seoul National University, Seoul, Korea