1. Cochrane Haematology, Department I of Internal Medicine; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany
2. Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf (CIO ABCD), Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany; Cologne Germany
3. Max-Planck Institute for the Biology of Ageing; Cologne Germany
4. German Centre for Infection Research (DZIF); partner site Bonn-Cologne Germany