1. Department of Emergency Medicine, Yeungnam University Hospital, Yeungnam University College of Medicine, Daegu, Korea.
2. Department of Emergency Medicine, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea.
3. Department of Preventive Medicine, Daegu Catholic University School of Medicine, Daegu, Korea.
4. Department of Emergency Medicine, Kyungpook National University Chilgok Hospital, School of Medicine, Kyungpook National University, Daegu, Korea.