1. 2nd Department of Ophthalmology, “Attikon” University Hospital, University of Athens, Athens - Greece
2. Department of Ophthalmology, Conquest Hospital, St. Leonarde on Sea, East Sussex - UK
3. 1st Department of Propaedeutic Medicine, Athens University Medical School, Laiko General Hospital, Athens - Greece
4. Department of Ophthalmology, “St. Panteleimon” General Hospital of Nikaia, Piraeus - Greece