[1] Kings Coll London, Leukaemia Sci Labs, Dept Haematol Med, London WC2R 2LS, England
[2] Kings Coll Hosp NHS Fdn Trust, Dept Haematol Med, London, England
[3] Kings Coll Hosp London, Dept Haematol, London, England
[4] Univ Dusseldorf, Dept Haematol Oncol & Clin Immunol, Dusseldorf, Germany