1. Department I of Internal Medicine and Centre of Integrated Oncology Cologne‐Bonn German CLL Study Group University Hospital CologneGermany
2. Department of Haematology, Oncology, Immunology, Palliative Care Infectious Diseases and Tropical Medicine German CLL Study Group Hospital Munich‐Schwabing MunichGermany
3. Department of Internal Medicine III University Hospital of Ulm UlmGermany
4. Cologne Cluster of Excellence in Cellular Stress Responses in Aging‐associated Disease (CECAD) University of Cologne CologneGermany
5. Oncogeriatric Unit Department of Geriatric Medicine St. Marien Hospital Cologne Germany