Grazzi Licia, Rizzoli Paul, Andrasik Frank
Headache Center, Neuroalgology Department, IRCCS Foundation "Carlo Besta" Neurological Institute, Milan, Italy.
John Graham Headache Center, Faulkner & Brigham Hospital, Harvard Medical School, Boston, MA, USA.
Neurol Sci. 2020 Dec;41(Suppl 2):461-462. doi: 10.1007/s10072-020-04659-0.