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Bruera, Osvaldo and Sances, Grazia and Leston, Jorge and Levin, Gloria and Cristina, Silvano and Medina, Carlos and Barontini, Marta and Nappi, Giuseppe and Figuerola, MarĂa de Lourdes (2008) Plasma melatonin pattern in chronic and episodic headaches. Evaluation during sleep and waking. Functional Neurology; New Trends in Interventional Neurosciences, 23 (2). pp. 77-81. ISSN 1971-3274