-Clinical significance of QT interval and Cardiac Enzyme in Carbon Monoxide Poisoning -The Association of Meteorological and Day-of-the-week Factors with Patient Visits to Emergency Centers -Cross-sectional Study of Physical Restraint Use in an Emergency Department -Estimate the Cuff Inflation Volume to Maintain Safe Intracuff Pressure of an Endotracheal Tube -Endoscopic Evaluation at Upper Gastrointestinal Injury in Patients with Noncaustic Drug Ingestion -Emergency Residents` Current Status and Preferences for Shift Work During Extra-regular Working Time in Korea