“…Because our review was limited to studies on psychoeducational interventions, we did not include literature reviews, meta-analyses, books, or program reports (see Eligibility Criteria and Study Selection ), although several were identified in the electronic search. However, we did manually scrutinize the reference lists of literature reviews and meta-analyses (Aylott, 2000; Bishop-Fitzpatrick et al, 2013; Broadstock et al, 2007; Brugha et al, 2015; Committee on Children With Disabilities, 1998; DeJong et al, 2014; El Achkar and Spence, 2015; Gates et al, 2017; Kasari et al, 2014; Lorenc et al, 2018; Matson et al, 2011, 2016; Millar et al, 2006; Nicholas et al, 2015; Ratto and Mesibov, 2015; Reichow and Volkmar, 2010; Reichow et al, 2013; Rutter, 1996; Schreibman, 1996; Shattuck et al, 2012; Sinha et al, 2004, 2006; Sturmey, 2012; Taylor et al, 2012; Tsai, 1999; Vismara and Rogers, 2010; Volkmar et al, 1999, 2014; Walton and Ingersoll, 2013; Weiss and Harris, 2001; Wong et al, 2015), books (Sheridan and Raffield, 2008; Volkmar et al, 2014), and program reports (Young et al, 2010) in order to identify relevant studies that did not appear in the electronic search.…”