1. Department I of Internal Medicine, Center for Integrated Oncology Cologne-Bonn, and Cluster of Excellence, Cellular Stress Responses in Aging-Associated Diseases, University of Cologne, Cologne, Germany;
2. Clinic of Hematology, University Hospital of Essen, Essen, Germany;
3. Institute of Neuropathology, University of Cologne, Cologne, Germany; and
4. Institute of Pathology, University Hospital Cologne, Cologne, Germany