H-W Chen1,2,3, Y-T Yeh4, D-M Tien5, C-B Yeh1,2,5. 1. Department of Emergency Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan. 2. Department of Emergency Medicine, Chung Shan Medical University, Taichung, Taiwan. 3. Department of Emergency Medicine, Taoyuan General Hospital Ministry of Health and Welfare, Taoyuan, Taiwan. 4. School of Dentistry, Chung Shan Medical University, Taichung, Taiwan. 5. School of Medicine, Chung Shan Medical University, Taichung, Taiwan.