1. Department of Emergency Medicine; Inje University Haeundae Paik Hospital; Busan; Korea
2. Department of Emergency Medicine; Soonchunhyang University Bucheon Hospital; Bucheon; Korea
3. Department of Emergency Medicine; Yonsei University College of Medicine; Seoul; Korea
4. Department of Research Affairs, Biostatistics Collaboration Unit; Yonsei University College of Medicine; Seoul; Korea
5. Department of Emergency Medicine; Inje University Ilasn Paik Hospital; Ilsanl; Korea