Paula Cramer, Susanne Isfort, Jasmin Bahlo, Stephan Stilgenbauer, Hartmut Döhner, Manuela Bergmann, Martina Stauch, Michael Kneba, Elisabeth Lange, Petra Langerbeins, Natali Pflug, Gabor Kovacs, Valentin Goede, Anna-Maria Fink, Thomas Elter, Kirsten Fischer, Clemens-Martin Wendtner, Michael Hallek, Barbara Eichhorst. Outcome of advanced chronic lymphocytic leukemia following different first-line and relapse therapies: a meta-analysis of five prospective trials by the German CLL Study Group (GCLLSG). Haematologica 2015;100(11):1451-1459; https://doi.org/10.3324/haematol.2015.124693.