1. Graham Headache Center Brigham and Women’s Faulkner Hospitals Boston MA USA
2. Department of Neurology Harvard Medical School Boston USA
3. Neuroalgology Unit IRCCS Fondazione Istituto Neurologico “Carlo Besta” Milan Italy
4. Department of Biomedical and Clinical Sciences “Luigi Sacco” University of Milan Milan Italy
5. Headache and Neuroalgology Unit IRCCS Fondazione Istituto Neurologico “Carlo Besta” Milan Italy