title: Letter to the Editor.
authors.affiliation: Child Neuropsychiatry Unit, Neuroscience Department, Via Gramsci 14, 43126 Parma, Italy; Child Neuropsychiatry, Materno-Infantile Department, University-Hospital of Parma, Parma, Italy. Electronic address: francesco.pisani@unipr.it.
authors.forename: Francesco
authors.initials: F
authors.lastname: Pisani
authors.affiliation: Child Neuropsychiatry, Materno-Infantile Department, University-Hospital of Parma, Parma, Italy.
authors.forename: Benedetta
authors.initials: B
authors.lastname: Piccolo
authors.affiliation: Child Neuropsychiatry, Department of Life and Reproduction Sciences, University of Verona, Verona, Italy.
authors.forename: Gaetano
authors.initials: G
authors.lastname: Cantalupo
authors.affiliation: Child Neuropsychiatry Unit, AUSL Rimini, Rimini, Italy.
authors.forename: Cristiana
authors.initials: C
authors.lastname: Copioli
authors.affiliation: Pediatric Neurology Unit, Arcispedale Santa Maria Nuova, Reggio Emilia, Italy.
authors.forename: Carlo
authors.initials: C
authors.lastname: Fusco
authors.affiliation: Neuroscience Department, University of Parma, Parma, Italy.
authors.forename: Annalisa
authors.initials: A
authors.lastname: Pelosi
authors.affiliation: Neuroscience Department, University of Parma, Parma, Italy.
authors.forename: Carlo Alberto
authors.initials: CA
authors.lastname: Tassinari
authors.affiliation: School of Life and Health Sciences, Aston Brain Centre, Aston University, Birmingham, UK; Department of Clinical Neurophysiology, The Birmingham Children's Hospital NHS Foundation Trust, Birmingham, UK.
authors.forename: Stefano
authors.initials: S
authors.lastname: Seri