1. Department of Hematology, Oncology, Stem Cell Transplantation, University Medical Center Freiburg, Freiburg, Germany;
2. Clinical Trials Unit, University Medical Center Freiburg, Freiburg, Germany;
3. Comprehensive Cancer Center Freiburg (CCCF), University Medical Center Freiburg, Freiburg, Germany;
4. Medizinische Klinik und Poliklinik II, Klinikum der Bayrischen Julius-Maximilians-Universität, Würzburg, Germany