1 Department I of Internal Medicine, University Hospital Cologne, Centre of Integrated Oncology Aachen Bonn Cologne Düsseldorf (CIO), Cologne, Germany. Electronic address: eyleen.reifarth@uk-koeln.de.
2 Department I of Internal Medicine, University Hospital Cologne, Centre of Integrated Oncology Aachen Bonn Cologne Düsseldorf (CIO), Cologne, Germany.