1. Ophthalmology Unit, Department of Biomedical Sciences, University of Messina, 98100 Messina, Italy
2. Ophthalmology Department, Faculty of Medicine and Health Sciences, Andrzej Frycz Modrzewski Kraków University, 30-705 Kraków, Poland
3. Hematology Unit, Department of Human Pathology in Adulthood and Childhood “Gaetano Barresi”, University of Messina, Via Consolare Valeria, 98125 Messina, Italy
4. Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Scientific Institute, 20132 Milan, Italy
5. Unit of Statistical and Mathematical Sciences, Department of Economics, University of Messina, 98100 Messina, Italy