Approximately 75% of Australian adults have experienced at least one traumatic event, and approximately 18% of Australians will develop Posttraumatic Stress Disorder (PTSD), a mental health condition that includes distressing symptoms such as flashbacks, nightmares and extreme anxiety, at some point during their life. This is a significant public health issue, as PTSD leads to the highest use of healthcare resources among psychiatric disorders, is costly, and negatively impacts the quality of life of individuals living with the disorder.