1. Department I of Internal Medicine & Center of Integrated Oncology Cologne-Bonn, German CLL Study Group, University Hospital Cologne, Cologne, Germany
2. Department of Hematology, Oncology, Immunology, Palliative Care, Infectious Diseases & Tropical Medicine, Klinikum Schwabing, Munich, Germany
3. Department III of Internal Medicine, University Hospital Ulm, Ulm, Germany
4. Department III of Internal Medicine, University Hospital Rostock, Rostock, Germany
5. Department II of Internal Medicine, Campus Kiel, University of Schleswig-Holstein, Kiel, Germany