“…ACT interventions were delivered in a group format ( n = 4; Brown et al., 2015; Chong et al., 2019; Corti et al., 2018; Whittingham et al., 2016) or individually ( n = 3; Davis et al., 2020; Mosher et al., 2019; Sairanen et al., 2019). Of the seven studies, ACT interventions were delivered as face-to-face sessions ( n = 4), telephone sessions (Mosher et al., 2019), online sessions guided by a personal coach (Sairanen et al., 2019), or using self-help booklets with minimal telephone support by a trained clinician (Davis et al., 2020). These studies involved two ACT sessions (Brown et al., 2015; Whittingham et al., 2016), four ACT sessions (Chong et al., 2019), six ACT sessions (Mosher et al., 2019), 10 ACT sessions (Sairanen et al., 2019), and 12 ACT sessions including booster sessions (Corti et al., 2018).…”