1. IRCCS Neuromed, Headache Unit, Italy
2. IRCCS Neuromed, Clinical Neurophysiology Unit, Italy
3. IRCCS San Raffaele Pisana, Unit of Clinical and Molecular Epidemiology, Italy
4. Sapienza University of Rome, Department of Neurology and Psychiatry, Italy
5. Sapienza University of Rome, Department of Medical-Surgical Sciences and Biotechnologies, Italy
6. University of Liège – CHR Citadelle, University Dept. of Neurology, Headache Research Unit, Belgium