[1] Hop Edouard Herriot, Dept Hematol, Lyon, France
[2] Leiden Univ, Med Ctr, Dept Med Stat, Leiden, Netherlands
[3] Univ Kiel, Dept Internal Med, D-24098 Kiel, Germany
[4] Birmingham Heartlands Hosp, Dept Hematol, Birmingham B9 5ST, W Midlands, England
[5] Hosp Clin Barcelona, Dept Hematol, Barcelona, Spain
[6] Huddinge Univ Hosp, Dept Hematol, S-14186 Huddinge, Sweden
[7] Hammersmith Hosp, Imperial Coll Sch Med, Dept Hematol, London, England
[8] Univ Leipzig, Dept Hematol Oncol, Leipzig, Germany