Measurement of melatonin in body fluids: standards, protocols and procedures - Almeida, Eduardo Alves de; Di Mascio, Paolo; Harumi, Tatsuo; Spence, D. Warren; Moscovitch, Adam; Hardeland, Rüdiger; Cardinali, Daniel P; Brown, Gregory M; Pandi-Perumal, S. R (Childs Nervous System, 2011)