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 Institute, Vita‐Salute San Raffaele University Milan Italy
5. Headache Center ASST Santi Paolo Carlo Milan Italy
6. Center for Headache and Intracranial Pressure Disorders Neurology Unit, A.O.U. Mater Domini Catanzaro Italy
7. Neuroalgology Unit Headache Center Fondazione IRCCS Istituto Neurologico “Carlo Besta” Milan Italy
8. San Giovanni Addolorata Hospital Rome Italy
9. San Filippo Neri Hospital Rome Italy
10. Headache and Neurosonology Unit Policlinico Universitario Campus Bio‐Medico Rome Italy