1. University of Cologne, First Department of Internal Medicine Center for Integrated Oncology Aachen Bonn Cologne Dusseldorf Cologne Germany
2. Krankenhaus Porz am Rhein Department of Internal Medicine Cologne Germany
3. Mildred Scheel School of Oncology Aachen Bonn Cologne Dusseldorf (MSSO ABCD) Faculty of Medicine and University Hospital Cologne Cologne Germany
4. Faculty of Medicine and University Hospital Cologne, Institute for Clinical Chemistry Cologne Germany