“…The RCTs included in these reviews were used as the basis of the evidence to be considered for the ISTSS guidelines. Existing reviews (Bisson, Andrew, Roberts, Cooper, & Lewis, ; Hoskins et al., ; Lewis, Roberts, Bethell, & Bisson, ; NICE, ; Roberts, Kitchiner, Kenardy, & Bisson, , ; Rose, Bisson, Churchill, Wessely, ; Sijbrandij, Kleiboer, Bisson, Barbui, & Cuijpers, ) were supplemented with additional systematic searches for more recent RCTs and by asking experts in the field as well as the ISTSS membership to identify any studies that might have been omitted. New systematic reviews were undertaken for the nonpsychological and nonpharmacological scoping questions.…”