In recent years a variety of treatment approaches have been shown to be effective in the treatment of PTSD. These include prolonged exposure therapies (PE), stress inoculation training (SIT), EMDR and psychopharmacological treatment with serotonin re-uptake blockers. While PE has been compared with SIT and a study is currently under way comparing cognitive-behavioral treatment with EMDR, no study as yet has compared the relative merits of pharmacotherapy alone vs an exposure treatment. While it is commonly held that, in order to recover, people with PTSD need to "process" their traumatic memories, treatments that do not involve the processing of traumatic memories (such as SIT or pharmacotherapy) may be just as effective. In clinical practice, many patients with PTSD appear to be effectively treated with pharmacological agents alone, without trauma-focused therapy.