[1] Univ Nottingham Hosp, Queens Med Ctr, Dept Haematol, NHS Trust, Nottingham NG7 2UH, England
[2] Catholic Univ Louvain, St Luc Univ Hosp, Brussels, Belgium
[3] Vivantes Hosp Friedrichshain, Berlin, Germany
[4] Glasgow Royal Infirm, Glasgow G4 0SF, Lanark, Scotland
[5] Univ Med Ctr Utrecht, Dept Hematol Van Creveldkliniek, Utrecht, Netherlands
[6] Univ Bonn, Dept Internal Med, D-5300 Bonn, Germany