1. Department of Hematology, Oncology and Palliative Care St. Josef‐Hospital Bochum Ruhr‐University Bochum Germany
2. Institute of Pathology Ruhr‐University Bochum Bochum Germany
3. Department of Medical Informatics Biometrics and Epidemiology Ruhr‐University Bochum Germany
4. Department of Internal Medicine St. Josefs Hospital Dortmund Dortmund Germany
5. Joint Practice of Hematology and Oncology Catholic Hospital Dortmund West Dortmund Germany
6. Department of General and Visceral Surgery Catholic Hospital Dortmund West Germany
7. Department of General and Visceral Surgery Paracelsus Medical University Hospital Nürnberg Nord Nürnberg Germany
8. Onkologie UnterEms Leer Germany
9. Department of Oncology and Hematology Klinikum Lippe Lemgo Germany
10. Department of Hematology, Oncology and Palliative Care St. Bernsward Hospital Hildesheim Germany
11. Joint Practice of Oncology and Hematology Bonn Germany
12. Department of Gastroenterology AKH Celle Celle Germany
13. Department of Oncology, Hematology and Palliative Care Asklepios Hospital, Cancer Center Altona Hamburg Germany