[1] Univ Cologne, Fac Med, Cologne, Germany
[2] Univ Cologne, Univ Hosp Cologne, Dept Internal Med 1, Ctr Integrated Oncol Aachen Bonn Cologne Duesseld, Cologne, Germany
[3] Univ Cologne, German CLL Study Grp, Cologne, Germany
[4] Univ Duisburg Essen, Univ Hosp Essen, West German Canc Ctr, Clin Hematol & Stem Cell Transplantat, Essen, Germany
[5] Ulm Univ, Div CLL, Dept Internal Med 3, Ulm, Germany
[6] Univ Ulm, Div CLL, Dept Internal Med 3, Ulm, Germany
[7] Multiprofile Hosp Act Treatment HristoBotev, Dept Internal Med 1, Vratsa, Bulgaria
[8] Box Hill Hosp, Melbourne, Vic, Australia
[9] Hosp Univ La Princesa, Madrid, Spain
[10] Wellington Rerenga Ora Blood & Canc Ctr, Capital & Coast Dist Hlth Board, Wellington, New Zealand
[11] Marien Hosp, Herne, Germany
[12] Palmerston North Hosp, Palmerston North, New Zealand
[13] Lund Univ Canc Ctr, Dept Hematol, Lund, Sweden
[14] Rigshosp, Copenhagen, Denmark
[15] Cantonal Hosp Lucerne, Div Hematol, Luzern, Switzerland
[16] Beaumont Hosp, Canc Trials Ireland, Dept Haematol, RCSI, Dublin, Ireland
[17] Univ Hosp Leuven, Leuven, Belgium
[18] Bnai Zion Med Ctr, Hematol, Haifa, Israel
[19] Helsinki Univ Hosp, Dept Hematol, Ctr Comprehens Canc, Helsinki, Finland
[20] Univ Helsinki, Helsinki, Finland
[21] Med Univ Vienna, Div Hematol & Hemostaseol, Dept Med 1, Vienna, Austria
[22] Albert Schweitzer Hosp, Dept Internal Med, Dordrecht, Netherlands
[23] German CLL Study Grp, Munich Clin Schwabing, Dept Hematol Oncol Immunol Palliat Care Infect Di, Munich, Germany
[24] Univ Schleswig Holstein, Dept Internal Med 2, Kiel, Germany
[25] Univ Hosp Ulm, Div CLL, Dept Internal Med 3, Ulm, Germany
[26] Acad Med Ctr, Amsterdam, Netherlands
[27] Copenhagen Univ Hosp, Dept Hematol, Rigshosp, Copenhagen, Denmark
[28] Univ Cologne, Cologne, Germany
[29] Univ Hosp Cologne, Ctr Integrated Oncol Aachen Bonn Cologne Duesseld, Cologne, Germany