1. Ophthalmology Clinic, University Hospital Ostrava, Ostrava, Czech Republic
2. Department of Ophthalmology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
3. Faculty of Medicine, University Ostrava, Ostrava, Czech Republic
4. Center for Integrated Oncology (CIO) Aachen-Bonn-Cologne-Duesseldorf, Cologne, Germany