[1] Univ Hosp North Midlands NHS Trust, Clin Haematol, Stoke On Trent, Staffs, England
[2] Keele Univ, Sch Med, Keele, Staffs, England
[3] Univ Hosp North Midlands NHS Trust, Blood Sci, Stoke On Trent, Staffs, England
[4] Univ Hosp North Midlands NHS Trust, Anaesthet, Stoke On Trent, Staffs, England