title: Greater occipital nerve as target for refractory chronic headaches: from corticosteroid block to invasive neurostimulation and back.
authors.affiliation: a Department of Clinical and Molecular Medicine , Sapienza University , Rome , Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Martelletti
authors.affiliation: b Department of Medicine and Science of Aging 'Gabriele d'Annunzio' , University of Chieti-Pescara , Chieti , Italy.
authors.forename: Maria Adele
authors.initials: MA
authors.lastname: Giamberardino
authors.affiliation: c Department of Neurology , Athens Naval Hospital , Athens , Greece.
authors.forename: Dimos-Dimitrios
authors.initials: DD
authors.lastname: Mitsikostas
keywords: Great Occipital Nerve block; corticosteroids treatment; neurostimulation; recfractoy chronic cluster headache; refractoy chronic migraine