1. Cochrane Haematology, Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany
2. University of Cologne, Faculty of Medicine and University Hospital Cologne, Department I of Internal Medicine; Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf; Cologne Germany
3. DFaG (Deutsche Fatigue Gesellschaft); Cologne Germany
4. Cochrane Haematology, Department I of Internal Medicine; Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany
5. Department I of Internal Medicine; Centre of Integrated Oncology Aachen Bonn Cologne Duesseldorf (CIO ABCD), Faculty of Medicine and University Hospital of Cologne, University of Cologne; Cologne Germany
6. Max-Planck Institute for the Biology of Ageing; Cologne Germany
7. Cochrane Cancer, Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany