1. Department of Internal Medicine I, University Hospital of Ulm, Ulm, Germany;
2. Institute of Molecular Medicine, Stem Cell and Aging, Ulm University, Ulm, Germany;
3. Institute of Experimental Cancer Research, University Hospital of Ulm, Ulm, Germany;
4. Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY;
5. AGAPLESION Bethesda Hospital, Geriatric Research Unit and
6. Geriatric Center Ulm/Alb-Donau, Ulm University, Ulm, Germany; and
7. Experimental Hematology and Cancer Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH