[1] Cardiff Univ, Sch Med, Dept Haematol, Cardiff CF14 4XN, S Glam, Wales
[2] Llandough Hosp, Dept Haematol, Penarth, S Glam, Wales
[3] Birmingham Heartlands Hosp, Dept Haematol, Birmingham, W Midlands, England
[4] Cardiff Univ, Sch Med, Dept Pathol, Cardiff CF14 4XN, S Glam, Wales