1 Department of Emergency Medicine, Lin-Kou Medical Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan and College of Medicine, Chang Gung University, Taoyuan, Taiwan School of Medicine, International Medical University, Kuala Lumpur, Malaysia and Sarawak General Hospital, Kuching, Sarawak, Malaysia Sarawak General Hospital, Kuching, Sarawak, Malaysia Department of Emergency Medicine, Lin-Kou Medical Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan and College of Medicine, Chang Gung University, Taoyuan, Taiwan chhli2002tw@gmail.com.