“…Consistent with previous reviews, psychotherapy was defined as an intervention in which the central element was verbal communication between a client and a therapist, or as a psychological treatment in the form of a website or book which the participant worked through somewhat independently but with guided support from a therapist (e.g., Kolovos, Kleiboer, & Cuijpers, 2016). We excluded four studies because an effect size could not be calculated and the relevant data necessary for calculating an effect size could not be provided (Freeman, Barry, Dunkeld-Turnbull, & Henderson, 1988;Freeman, Sinclair, Turnbull, & Annandale, 1985;Mitchell et al, 2001;Ordman & Kirschenbaum, 1985). We excluded four studies because an effect size could not be calculated and the relevant data necessary for calculating an effect size could not be provided (Freeman, Barry, Dunkeld-Turnbull, & Henderson, 1988;Freeman, Sinclair, Turnbull, & Annandale, 1985;Mitchell et al, 2001;Ordman & Kirschenbaum, 1985).…”