“…The children with ADHD were recruited from regular or special schools [Broadbent et al, 2004;Blomqvist et al, 2007;Blomqvist et al, 2011;Mota-Veloso et al, 2018a;Mota-Veloso et al, 2018b], Pediatric Dentistry clinics of universities [Grooms et al, 2005;Bimstein et al, 2008], child psychiatric public services [Chandra et al, 2009], psychiatric clinic of a university hospital [Chau et al, 2017], a medical clinic [Sabeti et al, 2017], a care house [Ehlers et al, 2019], and a district [Khobkham et al, 2020]. In 8 studies [Broadbent et al, 2004;Grooms et al, 2005;Blomqvist et al, 2007;Bimstein et al, 2008;Chandra et al, 2009;Mota-Veloso et al, 2018a , 2018b;Ehlers et al, 2019;Khobkham et al, 2020], participants without ADHD were recruited in the same setting of the participants of with ADHD. In 3 studies [Chandra et al, 2009;Chau et al, 2017;Sabeti et al, 2017], children without ADHD were recruited in a different setting of children with ADHD.…”