[1] Hosp Sick Children, Dept Paediat, Div Emergency Med, 555 Univ Ave, Toronto, ON M5G 1X8, Canada
[2] Univ Toronto, Dept Paediat, Toronto, ON, Canada
[3] Hosp Sick Children, Div Emergency Med, Toronto, ON, Canada
[4] Univ Toronto, Emergency Point Of Care Ultrasound Program, Hosp Sick Children, Dept Paediat,Div Emergency Med, Toronto, ON, Canada