1. Ophthalmology, University General Hospital of Ioannina, Greece
2. Anatomy-Histology-Embryology, University of Ioannina, Faculty of Medicine, Greece
3. Hematology Laboratory, Unit of Molecular Biology, University General Hospital of Ioannina, Greece
4. Ophthalmology, Birmingham and Midland Eye Centre, Birmingham, United Kingdom of Great Britain and Northern Ireland