1. Clinic and Polyclinic for Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.
2. Oncology/Palliative Care Network Landshut, Landshut, Germany.
3. VK&K Studien GbR, Landshut, Germany.
4. Department of Hematology and Medical Oncology, University Medical Center Göttingen, Göttingen, Germany.