1. Ophthalmology Unit, DAI Testa/Collo, Azienda Ospedaliera Universitaria Policlinico Umberto I, University of Rome “Sapienza”, Rome, Italy
2. Department of Biology, College of Science and Technology, Temple University, Philadelphia, Pennsylvania, USA
3. Ophthalmology Unit, St. Andrea Hospital, NESMOS Department, University of Rome “Sapienza”, Rome, Italy