1. Ophthalmology Unit, Dipartimento di Scienze Mediche e Chirurgiche, Alma Mater Studiorum University of Bologna, Bologna, Italy;
2. IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy; and
3. Ophthalmology Unit, Azienda Ospedaliero-Universitaria Careggi, UNIFARBA Department, University of Florence, Florence, Italy.