[1] NHLBI, Hematol Branch, NIH, Bldg 10, Bethesda, MD 20892 USA
[2] NCI, Lymphoid Malignancies Branch, Ctr Canc Res, NIH, Bethesda, MD 20892 USA
[3] German Canc Res Ctr, Heidelberg, Germany
[4] German Canc Consortium, Heidelberg, Germany
[5] Goethe Univ, Dept Med 2, Hematol Oncol, Frankfurt, Germany
[6] Goethe Univ, Frankfurt Canc Inst, Frankfurt, Germany