... All included articles were cross-sectional studies. Regarding recruitment approaches, participants were recruited from health care providers (Akins et al., 2014;Bilgic et al., 2013;Hanson et al., 2007;Harrington et al., 2006b;Huang et al., 2013;Levy et al., 2003;Salomone et al., 2015;Valicenti-McDermott et al., 2013;Wong and Smith, 2006;Wong, 2009), from a school (Witwer and Lecavalier, 2005), from two different registers (Carter et al., 2011;Granich et al., 2014;Perrin et al., 2012), via advertisement through autism-related organizations (Bowker et al., 2011;Christon et al., 2010;Goin-Kochel et al., 2007;Green et al., 2006;Hall and Riccio, 2012;Salomone et al., 2015), and conferences (Harrington et al., 2006a). The data collection methods included face-to-face interviews (Akins et al., 2014;Carter et al., 2011;Levy et al., 2003;Valicenti-McDermott et al., 2013), telephone interviews (Carter et al., 2011;Wong and Smith, 2006), interviewer-administered questionnaires (Bilgic et al., 2013;Wong, 2009), and self-administered questionnaires (Bowker et al., 2011;Christon et al., 2010;Goin-Kochel et al., 2007;Green et al., 2006;Hall and Riccio, 2012;Harrington et al., 2006a;Perrin et al., 2012;Salomone et al., 2015;Witwer and Lecavalier, 2005), including webbased questionnaires and mailed questionnaires. ...