“…Three studies (Pan et al, 2016(Pan et al, , 2017(Pan et al, , 2019 described the presence of comorbid neurodevelopmental disorders (i.e., Autism Spectrum Disorder (ASD), Tourette syndrome and Oppositional Defiant Disorder), while eight (Chang et al, 2014;Da Silva et al, 2020;Orangi et al, 2021;Pan et al, 2019;Torabi et al, 2018;Verret et al, 2012;Yazd et al, 2015;Ziereis & Jansen, 2015) defined clear exclusion criteria in terms of (neurodevelopmental) comorbidities. Three studies (Jung & Suh, 2017;Kosari et al, 2012;Meßler et al, 2018) did not apply any exclusion criteria on comorbid disorders, nor described their presence. Eight studies reported the number of participants that were taking medication at baseline (Chang et al, 2014;Meßler et al, 2018;Pan et al, 2016Pan et al, , 2017Pan et al, , 2019Verret et al, 2012;Yazd et al, 2015;Ziereis & Jansen, 2015), one of which considered medication intake as a randomization criterion (Pan et al, 2016).…”