1. Department of Internal Medicine III; University of Rostock; Rostock Germany
2. Department of Internal Medicine V; University Clinic Heidelberg; Heidelberg Germany
3. Institute of Experimental Gene Therapy and Cancer Research, University of Rostock; Rostock Germany
4. Department of Internal Medicine III; University of Ulm; Ulm Germany
5. Department of Hematology/Oncology; Jena University Hospital; Jena Germany
6. Department of Internal Medicine C; Hematology/Oncology, University of Greifswald; Greifswald Germany