1. Department of Ophthalmology Aarhus University Hospital Aarhus N Denmark
2. Department of Ophthalmology Faculty of Medicine and dentistry Palacký University Olomouc Olomouc Czech Republic
3. Department of Ophthalmology Military University Hospital Prague First Faculty of Medicine Charles University Prague Czech Republic
4. Department of Ophthalmology and Physiology University of Iceland Reykjavik Iceland