1. Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf and German CLL Study Group, University Hospital of Cologne, Cologne, Germany
2. Praxis für Hämatologie und Onkologie Cottbus, Cottbus, Germany
3. BAG MVZ Dr. Vehling-Kaiser GmbH, Landshut, Landshut, Germany
4. Onkologie Ravensburg, Ravensburg, Germany
5. Onkologie und Palliativmedizin Hamburg, Praxis für Hämatologie, Hamburg, Germany
6. Klinikum Lippe Standort Lemgo, Lemgo, Germany
7. Medizinische Klinik III, University Hospital of Rostock, Rostock, Germany
8. Innere Medizin III, University Hospital Schleswig Holstein, Kiel, Germany
9. Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, University Hospital of Cologne, Cologne, Germany
10. Division of CLL, Klinik für Innere Medizin III, University Hospital Ulm, Ulm, Germany
11. Munich Clinic Schwabing, Academic Teaching Hospital, Ludwig-Maximilian University (LMU), Munich, Germany