1. Department of Emergency Medicine, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea
2. Department of Biostatistics, School of Medicine, Medical Research Collaboration Center, Kyungpook National University, Daegu, Korea
3. Department of Emergency Medicine, Yeungnam University College of Medicine, Daegu, Korea
4. Department of Emergency Medicine, Dongsan Medical Center, Keimyung University, Daegu, Korea