1. Department of Emergency Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
2. Department of Emergency Medicine, Bundang Jesaeng General Hospital, Seongnam, Korea.
3. Department of Emergency Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
4. Department of Emergency Medicine, Inje University College of Medicine, Busan, Korea.