[1] Cardiff Univ, Welsch Sch Med, Cardiff, Wales
[2] KCL, Sch Med, Dept Med & Mol Genet, London, England
[3] UCH, Sch Med, Dept Haematol, London, England
[4] Leicester Royal Infirm, Dept Haematol, Leicester, Leics, England
[5] Birmingham Heartlands Hosp, Dept Haematol, Birmingham, W Midlands, England
[6] Plymouth Hosp NHS Trust, Dept Haematol, Plymouth, Devon, England
[7] City Hosp, Dept Haematol, Nottingham, England
[8] Univ Birmingham, Birmingham Clin Trials Unit, Birmingham, W Midlands, England