Department of Internal Medicine I, Ulm University, Ulm, Delaware, USA. Private Practice, Onkologie Ravensburg, Ravensburg, Germany. Interdisciplinary Tumor Center, University Hospital Mannheim, Mannheim, Germany. Department of Medical Oncology and Comprehensive Cancer Center, Ludwig Maximilians University, Munich, Germany. Internal Medicine II, Klinikum Weimar, Weimar, Germany. Medizinische Klinik, Klinikum Schwäbisch Gmünd, Stauferklinik, Mutlangen, Baden-Württemberg, Germany. Medizinische Klinik, Westküstenklinikum Heide, Heide, Schleswig-Holstein, Germany. Private Practice, Schwerpunktpraxis Hämatologie/Onkologie, Bottrop, Germany. Internal Medicine I, Martin-Luther-University Halle-Wittenberg, Halle, Germany.