“…Nineteen studies contributed with IPD on speech production. As a rough overview of these studies, the therapy was implemented in the form of intensive summer camps in three studies (Pamplona et al, 2014(Pamplona et al, , 2017Van Demark & Hardin, 1986), the SLT was implemented in the form of conventional clinical care in four studies (Derakhshandeh et al, 2016;Pamplona & Ysunza, 2018;Roxburgh et al, 2016;Sweeney et al, 2020), the therapy was implemented through an initial short workshop led by SLTs and then carried out by parents or speech assistants over a long duration in nine studies (Dobbelsteyn et al, 2014;Hanchanlert et al, 2015;Makarabhirom et al, 2015;Prathanee, 2011;Prathanee et al, 2014Prathanee et al, , 2020Pumnum et al, 2015;Scherer et al, 2008;Sritacha et al, 2016), and the therapy was very brief in three studies (Alighieri et al, 2019;Lindeborg et al, 2020;Luyten et al, 2016). See Table 1 for a general overview of these studies, and see Table 2 for risk of bias assessment of these studies.…”