"Posttraumatic stress disorder (PTSD) is a common and disabling condition that often goes undiagnosed for years, and even when the diagnosis is made, treatment is frequently ineffective, especially for combat veterans. Cognitive behavioural therapy with imaginal exposure is considered first-line treatment, but many cannot or will not engage in imaginal exposure, which is not surprising, since avoidance of reminders of the trauma is a defining feature of PTSD." (Quoted from site)