[1] Western Univ, Schulich Sch Med & Dent, Dept Pediat Internal Med Epidemiol & Biostat, London, ON, Canada
[2] Nationwide Childrens Hosp, Dept Pediat, Columbus, OH USA
[3] Univ Colorado, Dept Pediat, Sch Med, Aurora, CO USA
[4] Univ Basque Country UPV EHU, Biocruces Bizkaia Hlth Res Inst, Hosp Univ Cruces Univ, Pediat Emergency Dept, Bilbao, Spain
[5] Monash Univ, Dept Paediat, Clayton, Vic, Australia
[6] Univ Leicester, SAPPHIRE Grp, Hlth Sci, Leicester, England
[7] Leicester Royal Infirm, PEMLA Grp, Childrens Emergency Dept, Leicester, England
[8] Hadassah Hebrew Univ Hosp, Dept Paediat, Jerusalem, Israel