1. Headache and Pain Unit IRCCS San Raffaele Pisana Rome Italy
2. San Raffaele University Rome Italy
3. IRCCS Istituto delle Scienze Neurologiche Bologna Italy
4. Neurology Unit IRCCS San Raffaele Scientific InstituteVita‐Salute San Raffaele University Milan Italy
5. San Giovanni Addolorata Hospital Rome Italy
6. Unit of Neurology Department of Medicine and Surgery Headache Center University of Parma Parma Italy
7. Neurophysiopathology Unit Headache Center University Hospital of Rome “TorVergata” Rome Italy
8. San Filippo Neri Hospital Rome Italy
9. Center for Headache and Intracranial Pressure Disorders Neurology Unit A.O.U. Mater Domini Catanzaro Italy
10. Neuroalgology Unit Headache Center Fondazione IRCCS Istituto Neurologico “Carlo Besta” Milan Italy
11. Headache and Neurosonology Unit Policlinico Universitario Campus Bio‐Medico Rome Italy