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The aim of this article was to assess the differences in serum 25(OH)D levels between children and adolescents with attention-deficit/hyperactivity disorder (ADHD) and healthy controls. We used the PubMed (1966–2017), Scopus (2004–2017), ClinicalTrials.gov (2008–2017), Cochrane Central Register of Controlled Trials CENTRAL (2000–2017), and Google Scholar (2004–2017) databases. Statistical meta-analysis...