Yongwei Guo1, Konrad R Koch1, Ludwig M Heindl2,3. 1. Department of Ophthalmology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Kerpener Strasse 62, 50937, Cologne, Germany. 2. Department of Ophthalmology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Kerpener Strasse 62, 50937, Cologne, Germany. ludwig.heindl@uk-koeln.de. 3. Center for Integrated Oncology (CIO) Aachen-Bonn-Cologne-Duesseldorf, Cologne, Germany. ludwig.heindl@uk-koeln.de.