[1] Natl Univ Hlth Syst, Natl Univ Hosp, Emergency Med Dept, Singapore, Singapore
[2] Natl Univ Singapore, Yong Loo Lin Sch Med, Dept Surg, Singapore, Singapore
[3] Singapore Gen Hosp, Dept Emergency Med, Singapore, Singapore
[4] Natl Univ Singapore Hosp, Emergency Med Dept, 9 Lower Kent Ridge Rd, Level 4, Singapore 119085, Singapore