[1] Natl Univ Singapore, Yong Loo Lin Sch Med, Singapore, Singapore
[2] SingHealth, Dept Emergency Med, KK Womens & Childrens Hosp, Singapore, Singapore
[3] SingHealth, Accid & Emergency Dept, Changi Gen Hosp, Singapore, Singapore
[4] SingHealth, Dept Emergency Med, Singapore Gen Hosp, Singapore, Singapore
[5] SingHealth, Dept Emergency Med, Sengkang Gen Hosp, 110 Sengkang E Way, Singapore 544886, Singapore