1. Institute for Medical Information Sciences, Biometry, and Epidemiology (IBE); Ludwig-Maximilians University; Munich Germany
2. Department of Medicine; University of Heidelberg; Mannheim Germany
3. Department of Hematology/Oncology; Caritas-Krankenhaus Lebach; Lebach Germany
4. Department of Oncology and Hematology; Oldenburg Clinic; Oldenburg Germany
5. Hematology/Oncology Clinic, St. Marien Hospital, Katholisches Krankenhaus Hagen; Hagen Germany