1. SC Neuroalgologia-Centro Cefalee, Fondazione IRCCS Istituto Neurologico Carlo Besta, 20133 Milan, Italy
2. SC Neurologia Salute Pubblica e Disabilità, Fondazione IRCCS Istituto Neurologico Carlo Besta, 20133 Milan, Italy
3. John Graham Headache Center, Brigham & Women’s Faulkner Hospital, Harvard Medical School, Boston, MA 02115, USA