1. Department of Emergency Medicine, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea.
2. Department of Emergency Medicine, College of Medicine, Chosun University, Gwangju, Korea.
3. Department of Emergency Medicine, Chonnam National University Medical School, Gwangju, Korea.
4. Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
5. Department of Emergency Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
6. Department of Emergency Medicine, Konyang University College of Medicine, Daejeon, Korea.
7. Department of Emergency Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea.
8. Department of Emergency Medicine, Ajou University School of Medicine, Suwon, Korea.
9. Department of Emergency Medicine, Inje University Ilsan Paik Hospital, Ilsan, Korea.
10. Department of Emergency Medicine, Chungbuk National University Hospital, Cheongju, Korea.
11. Department of Emergency Medicine, College of Medicine, Chungnam National University, Daejeon, Korea.
12. Department of Emergency Medicine, Chuncheon Sacred Heart Hospital, College of Medicine, Hallym University, Chuncheon, Korea.
13. Department of Emergency Medicine, Inje University Haeundae Paik Hospital, Busan, Korea.
14. Department of Emergency Medicine, College of Medicine, Korea University Hospital, Seoul, Korea.
15. Department of Emergency Medicine, Hanyang University College of Medicine, Seoul, Korea.
16. Department of Emergency Medicine, Konkuk University School of Medicine, Seoul, Korea.
17. Department of Research Affairs, Biostatistics Collaboration Unit, Yonsei University College of Medicine, Seoul, Korea.