1. Chang-Gung Medical Education Research Center, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Linkou, Taiwan;
2. Department of Emergency Medicine, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Linkou, Taiwan;
3. School of Nursing, Chang Gung University of Science and Technology, Gueishan, Taiwan;
4. Department of Emergency Medicine, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Keelung, Taiwan