1. Stem Cells and Eye Research Laboratory, Department of Ophthalmology, Faculty of Medicine, Albert Szent-Györgyi Clinical Center, University of Szeged, Szeged, Hungary
2. Centre of Eye Research, Department of Ophthalmology, Oslo University Hospital and University of Oslo, Oslo, Norway
3. Department of Ophthalmology, University of Eastern Finland and Kuopio University Hospital, Kuopio, Finland
4. Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia