1. Department of Medicine; Neurologic Clinic, Headache Centre; University of Perugia; Perugia Italy
2. Department of Medicine; Otolaryngology and Head-Neck Surgery Clinic; University of Perugia; Perugia Italy
3. Neuroscience Department; Neurologic Clinic; S. Maria Hospital of Terni; Terni Italy
4. IRCCS, Santa Lucia Foundation; European Brain Research Institute; Rome Italy