title: Letter From the Guest Editor.
authors.affiliation: Nuclear Medicine Unit, Department of Medicine DIMED University-Hospital of Padova, Italy. Electronic address: pietro.zucchetta@unipd.it.
authors.forename: Pietro
authors.initials: P
authors.lastname: Zucchetta
mesh_terms: D002648:Child; D006801:Humans; D009683:Nuclear Medicine; D010372:Pediatrics