Stilgenbauer S, Sander S, Bullinger L, Benner A, Leupolt E, Winkler D, Kröber A, Kienle D, Lichter P, Döhner H. Clonal evolution in chronic lymphocytic leukemia: acquisition of high-risk genomic aberrations associated with unmutated VH, resistance to therapy, and short survival. Haematologica 2007; 92(9):1242-1245; https://doi.org/10.3324/haematol.10720.