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Cevoli, Sabina; Pizza, Fabio; Grimaldi, Daniela; Nicodemo, Marianna; Favoni, Valentina; Pierangeli, Giulia; Valko, Philipp O; Baumann, Christian R; Montagna, Pasquale; Bassetti, Claudio L; Cortelli, Pietro (2011). Cerebrospinal fluid hypocretin-1 levels during the active period of cluster headache. Cephalalgia, 31(8), pp. 973-6. London: Sage Publications 10.1177/0333102411403634
