[1] Manchester Univ NHS Fdn Trust, Emergency Dept, Manchester, Lancs, England
[2] Univ Manchester, Div Cardiovasc Sci, Manchester, Lancs, England
[3] Salford Royal NHS Fdn Trust, Emergency Dept, Salford, Lancs, England
[4] Univ Lancaster, Med Sch, Lancaster, England
[5] Bolton NHS Fdn Trust, Emergency Dept, Bolton, England
[6] Univ Manchester, Humanitarian & Conflict Response Inst, Manchester, Lancs, England
[7] Stockport NHS Fdn Trust, Emergency Dept, Stockport, Lancs, England
[8] Lancashire Teaching Hosp NHS Fdn Trust, Emergency Dept, Preston, Lancs, England
[9] Royal Coll Emergency Med, London, England
[10] Manchester Metropolitan Univ, PostGrad Med, Manchester, Lancs, England