Department of Emergency Medicine, College of Medicine, Chungbuk National University, Cheongju, Chungbuk 361-763, Korea;
Department of Emergency Medicine, College of Medicine, Chungbuk National University, Cheongju, Chungbuk 361-763, Korea;
Department of Emergency Medicine, College of Medicine, Chungbuk National University, Cheongju, Chungbuk 361-763, Korea;
Department of Emergency Medicine, College of Medicine, Chungbuk National University, Cheongju, Chungbuk 361-763, Korea;