"Now, a number of new studies may help researchers disentangle the condition's causes from its effects and, in doing so, bring a better understanding of how the disorder might be prevented or treated....
"The model suggests that three factors are necessary in order for PTSD to develop: a person needs to have certain risk factors for the condition, he or she must be exposed to a traumatic event, and after that event, further changes to the brain need to occur...."
http://www.livescience.com/38038-ptsd-develops-model.html
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