1. Eye Clinic, Department of Surgical Sciences, University of Cagliari, Via Università 40, 09124 Cagliari, Italy
2. Ocular Surface and Dry Eye Center, ASST Fatebenefratelli-Sacco, Ospedale L. Sacco-Università di Milano, Via Giovanni Battista Grassi 74, 20157 Milan, Italy
3. Ophthalmology, Foundation Campus Bio-Medico University Hospital, Via Alvaro del Portillo 200, 00128 Rome, Italy
4. Department of Clinical Science and Community Health, University of Milan, Eye Clinic San Giuseppe Hospital, IRCCS Multimedica, Via San Vittore 12, 20123 Milan, Italy