“…A considerable number of these papers, for example, in case of attention deficit hyperactivity disorder (ADHD; Faraone, Sergeant, Gillberg, & Biederman, 2003; Simon, Czobor, Bálint, Mészáros, & Bitter, 2009; Van Emmerik-van Oortmerssen, 2012; Polanczyk, Willcutt, Salum, Kieling, & Rohde, 2014; Thomas, Sanders, Doust, Beller, & Glasziou, 2015; T. Wang et al, 2017b), mood disorders (Cameron, Sedov, & Tomfohr-Madsen, 2016; Clemente et al, 2015; Ghaemmohamadi et al, 2017; J. Wang et al, 2017a), anxiety disorders (Baxter, Scott, Vos, & Whiteford, 2013; Guo et al, 2016; Miloyan, Bulley, Bandeen-Roche, Eaton, & Gonçalves-Bradley, 2016), psychotic disorders/symptoms (Clancy, Clarke, Connor, Cannon, & Cotter, 2014; Jääskeläinen et al, 2018), substance use (Fan et al, 2017; Feng & Newman, 2016; Hunt, Malhi, Cleary, Lai, & Sitharthan, 2016; Lemstra et al, 2008) or ‘common mental disorders’ in general (Steel et al, 2014) – emphasized that the estimated prevalence differences between countries might be highly influenced by both the assessment protocol (e.g.…”