[1] UCLH, Dept Haematol, London, England
[2] Hillingdon Hosp, Dept Haematol, London, England
[3] Queens Med Ctr, Dept Haematol, Nottingham NG7 2UH, England
[4] Chesterfield Royal Hosp, Dept Haematol, Chesterfield, Derby, England
[5] GlaxoSmithKline Inc, Uxbridge, Middx, England
[6] Univ Manchester, Manchester, Lancs, England
[7] Manchester Royal Infirm, Dept Haematol, Manchester M13 9WL, Lancs, England