title: Reply to Prof Ian J. Cohen.
authors.affiliation: Neuro-Oncology Unit, Department of Pediatric Oncology, Anna Meyer Children's University Hospital, Florence, Italy. mauriziolucchesi84@gmail.com.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Lucchesi
authors.affiliation: Neuro-Oncology Unit, Department of Pediatric Oncology, Anna Meyer Children's University Hospital, Florence, Italy.
authors.forename: Iacopo
authors.initials: I
authors.lastname: Sardi