1 University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Internal Medicine, German CLL Study Group, Center for Integrated Oncology Aachen, Bonn, Cologne, and Duesseldorf (CIO), Aachen Germany. Electronic address: kirsten.fischer@uk-koeln.de.
2 University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Internal Medicine, German CLL Study Group, Center for Integrated Oncology Aachen, Bonn, Cologne, and Duesseldorf (CIO), Aachen Germany; The Francis Crick Institute, London, UK; UCL Cancer Institute, University College London, London, UK.