1. Amgen Research (Munich), Munich, Germany;
2. Department of Medicine II, Goethe University Frankfurt, Frankfurt, Germany;
3. Department of Internal Medicine III, University Hospital Ulm, Ulm, Germany;
4. Department of Medicine A, University of Münster, Münster, Germany;
5. Department of Medicine II, Christian-Albrechts-Universität zu Kiel, Kiel, Germany;
6. Department of Medicine I, Albert-Ludwigs-Universität Frieburg, Freiburg, Germany;
7. Department of Medicine II, Eberhard Karls Universität Tübingen, Tübingen, Germany;
8. Department of Hematology and Oncology, Medizinische Hochschule Hannover, Hannover, Germany;
9. Department of Medicine III, University of Regensburg, Regensburg, Germany;
10. Amgen, Rockville, MD; and
11. Department of Medicine II and
12. Comprehensive Cancer Center Mainfranken, Universitätsklinikum Würzburg, Würzburg, Germany