1. Department I of Internal Medicine and Center of Integrated Oncology Cologne Bonn, University of Cologne, Cologne, Germany;
2. Department of Internal Medicine, Division of Hematology, Mayo Clinic, Rochester, MN;
3. Department I of Internal Medicine, Hospital München-Schwabing, Munich, Germany;
4. Cochrane Hematological Malignancies Group, University of Cologne, Cologne, Germany;
5. Institute of Clinical Chemistry, University Hospital of Cologne, Cologne, Germany;
6. Department of Health Sciences Research, Mayo Clinic, Rochester, MN;
7. Department of Internal Medicine III, Ulm University, Ulm, Germany;
8. Department of Internal Medicine I, Division of Hematology and Haemostaseology and Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria;
9. Hämatologische und Onkologische Schwerpunktpraxis, Erlangen, Germany;
10. Department III of Internal Medicine, University Hospital of Salzburg, Salzburg, Austria; and
11. Institute for Medical Statistics and Epidemiology, Technical University Munich, Munich, Germany