Post-traumatic stress disorder (PTSD) is a mental health condition that is triggered by a potentially traumatic event (PTE) (e.g., violent personal assault, mugging, robbery or serious road accident) either experienced or witnessed, in which the individual experiences extreme emotions of helplessness, fear of harm, or death [1]. PTSD occurs in 5 to 12% of the population and is often twice as common in women as in men [2]. PTSD can develop immediately after the PTE, or it can occur weeks, months or even years later. PTSD affects approximately 1 in 3 people who have a PTE, but it is unclear exactly why some people develop the condition