1. Department of Emergency Medicine, Ajou University School of Medicine, Suwon, Korea.
2. Department of Emergency Medicine, School of Medicine, Ewha Womans University, Seoul, Korea.
3. Department of Emergency Medicine, College of Medicine, Chosun University, Gwangju, Korea.
4. Department of Psychiatrics, Ajou University School of Medicine, Suwon, Korea.
5. Department of Pediatrics, Ajou University School of Medicine, Suwon, Korea.