[1] Charite, Dept Med 111, D-12200 Berlin, Germany
[2] Schering AG, Med Dev Oncol US, Berlin, Germany
[3] Univ Vienna, Dept Hematol & Oncol, Vienna, Austria
[4] Univ Med Ctr St Radboud Nijmegen, Nijmegen, Netherlands
[5] Osaka Univ, Grad Sch Med, Dept Mol Med, Osaka, Japan
[6] Hammersmith Hosp, Dept Immunol, London, England