1. Department of Emergency Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
2. Department of Emergency Medicine, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
3. Department of Emergency Medicine, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
4. Department of Emergency Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea.