Evaluation of the prophylactic efficacy of amitriptyline and citalopram, alone or in combination, in patients with comorbidity of depression, migraine, and tension-type headache - Rampello, L; Alvano, A; Chiechio, S; Malaguarnera, M; Raffaele, R; Vecchio, I; Nicoletti, F (Neuropsychobiology, 2004)