High concentrations of the melatonin metabolite, N-1-acetyl-N (2)-formyl-5-methoxykynuramine, in cerebrospinal fluid of patients with meningitis: a possible immunomodulatory mechanism - Silva, Sueli de Oliveira; Ximenes, Valdecir Farias; Livramento, José Antônio; Catalani, Luiz Henrique; Campa, Ana (Journal of Pineal Research, 2005)