1 Department of Haematology/Oncology and Palliative Care, Klinikum Stuttgart, Stuttgart Cancer Centre, 70174 Stuttgart, Germany; Department of Medical Oncology, University Hospital Basel, Basel, Switzerland.
2 Department of Haematology/Oncology and Palliative Care, Klinikum Stuttgart, Stuttgart Cancer Centre, 70174 Stuttgart, Germany. Electronic address: g.illerhaus@klinikum-stuttgart.de.