[1] Uniklin Koln, Klin Innere Med 1, Deutsch CLL Studiengrp, Cologne, Germany
[2] Evangel Krankenhaus Hamm, Klin Hamatol Onkol & Palliat Med, Hamm, Germany
[3] Klinikum Frankfurt Oder, Med Klin 1, Frankfurt, Oder, Germany
[4] Univ Klin Ulm, Innere Med 3, Ulm, Germany
[5] Stadt Klinikum Munchen, Klin Hamatol Onkol Immunol Palliat Med, Munich, Germany
[6] St Marienhosp Koln, Sekt Onkol Geriatrie, Cologne, Germany