[1] Univ North Carolina Sch Med, Chapel Hill, NC USA
[2] Singapore Gen Hosp, Singapore, Singapore
[3] Univ Toronto, St Michaels Hosp, Toronto, ON, Canada
[4] Monash Univ, Alfred Hosp Emergency & Trauma Ctr, Melbourne, Vic, Australia
[5] Tel Aviv Med Ctr & Sch Med, Tel Aviv, Israel
[6] Uniformed Serv Univ Hlth Sci, Hlth Sci, Bethesda, MD USA
[7] Akron Gen Med Ctr, Akron, OH USA
[8] Coll Emergency Med, London, England
[9] Univ Maryland Sch Med, Baltimore, MD USA
[10] Univ Stellenbosch, Cape Town, South Africa
[11] Australian Natl Univ Med Sch, Canberra Hosp, Australian Govt Dept Hlth & Ageing, Canberra, ACT, Australia
[12] Indiana Univ Sch Med, Dept Emergency Med, Chair Emergency Med, Indianapolis, IN 46202 USA