[1] Univ Leicester, Coll Life Sci, Dept Hlth Sci, Leicester, Leics, England
[2] King Saud Bin Abdulaziz Univ Hlth Sci, Coll Appl Med Sci, Emergency Med Serv Dept, Riyadh, Saudi Arabia
[3] Univ Hosp Leicester NHS Trust, Leicester, Leics, England
[4] Univ Sheffield, Ctr Urgent & Emergency Care Res, Sheffield, S Yorkshire, England
[5] Univ Leicester, Dept Cardiovasc Sci, Leicester, Leics, England