1. Department of Thoracic and Cardiovascular Surgery, School of Medicine, Konkuk University Chungju Hospital, Chungju-si, Republic of Korea
2. Department of Thoracic and Cardiovascular Surgery, School of Medicine, Konkuk University Seoul Hospital, Seoul, Republic of Korea
3. Department of Emergency Medicine, School of Medicine, Konkuk University Chungju Hospital, Chungju-si, Republic of Korea
4. Department of Internal Medicine, School of Medicine, Konkuk University Chungju Hospital, Chungju-si, Republic of Korea