1. Neuro-Ophthalmology Unit, Presidio Ospedaliero Oftalmico, Rome, Italy
2. Multiple Sclerosis Centre, Presidio Ospedaliero San Filippo Neri, Rome, Italy
3. Università Cattolica del Sacro Cuore School of Medicine, Rome, Italy
4. Neurology Unit, Presidio Ospedaliero San Filippo Neri, Rome, Italy