[1] Chang Gung Mem Hosp, Dept Emergency Med, 5 Fuxing St, Taoyuan 333, Taiwan
[2] Chang Gung Univ, Coll Med, 5 Fuxing St, Taoyuan 333, Taiwan
[3] Natl Taiwan Univ, Inst Hlth Policy & Management, 17 Xu Zhou Rd, Taipei 100, Taiwan
[4] Chang Gung Univ, Coll Med, Div Med Educ, Grad Inst Clin Med Sci, 259 Wenhua 1st Rd, Taoyuan 333, Taiwan