1. Division of Surgical Oncology and Thoracic Surgery, Oncology and Palliative Care, Helios Medical Centre, Bad Saarow, Germany
2. Department of Surgery, Oncology and Palliative Care, Helios Medical Centre, Bad Saarow, Germany
3. Department of Haematology, Oncology and Palliative Care, Helios Medical Centre, Bad Saarow, Germany
4. Department of Pathology, Medical Faculty Mannheim, University of Heidelberg, Bonn, Germany
5. Department of Pathology, University of Bonn Medical School, Bonn, Germany