“…Other than that, each study was conducted in German (Schmidt et al 2021), Florida (Agarwal et al, 2021), Sweden (Johansson et al, 2017), Greece (Dimitriadou et al, 2017), Ireland (Gadd, 2020), Scotland (Anderson et al, 2020), England (Hassiotis et al, 2020), Among the 28 articles, 19 articles involve persons with intellectual or learning disabilities as a research sample (Bennett et al, 2019;Cano et al, 2019;Chan et al, 2018;Chou et al, 2017;Collier et al, 2017;Cullen et al, 2017;Dell'Armo et al, 2019;Dimitriadou et al, 2017;Gadd, 2020;Ho et al, 2018;Houseworth et al, 2018;Kilincaslan et al, 2019;Lin et al, 2020;Park & Park, 2019;Ryan et al, 2019;Schmidt et al, 2021;Stancliffe & Anderson 2017;Terras et al, 2018;Williams et al, 2018). Six articles analyse data from the parents or caregivers of the persons with intellectual disabilities (Agarwal et al, 2021;Bouck, 2020;Brown et al, 2018;Janson & Aure, 2021;Roos & Sondenaa, 2020;Thompson et al, 2018), and three articles employ professionals involved directly with persons of intellectual disabilities as research participants (Anderson et al, 2020;Hassiotis et al, 2020;Johansson et al, 2017).…”