1. Department I of Internal Medicine, Center for Integrated Oncology Aachen, Bonn, Cologne, Düsseldorf, University Hospital of Cologne, Cologne, Germany
2. Clinic III for Internal Medicine, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
3. Center for Integrated Oncology Aachen, Bonn, Köln, Düsseldorf, University Cologne, Cologne, Germany
4. Department of Ophthalmology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany