“…From previous studies we know that co-morbid presentations of substance misuse together with anxiety-based disorders, particularly those linked to trauma are highly prevalent within Substance Misuse Service (SMS) patient populations (Sims et al , 2003; Weaver et al , 2005; Merkes et al , 2010; Crombe et al , 2009; Mills et al , 2011; Mulvihill et al , 2017). In fact some estimates place the incidence of trauma-based co-morbidity as high as 80 per cent (Weaver et al , 2003).…”