1. 2nd Department of Ophthalmology, School of Medicine, Aristotle University of Thessaloniki, “Papageorgiou” General Hospital, Thessaloniki, Macedonia, Greece
2. 1st Department of Ophthalmology, University of Athens, General Hospital “G. Gennimatas”, Athens, Greece
3. Department of Ophthalmology, School of Medicine, Aristotle University of Patras, University General Hospital of Patras, Patras, Greece
4. 1st Department of Microbiology, School of Medicine, Aristotle University of Thessaloniki, Macedonia, Greece