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In page Stockholm syndrome:

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The DSM-5 is widely used as the "classification system for psychological disorders" by the American Psychiatric Association.[1] Stockholm syndrome has not historically appeared in the manual, as many believe it falls under trauma bonding or post-traumatic stress disorder (PTSD) and there is no consensus about the correct clarification. In addition, there is no extensive body of research or consensus to help solve the argument,[citation needed] although before the fifth edition (DSM 5) was released, Stockholm syndrome was under consideration to be included under 'Disorders of Extreme Stress, Not Otherwise Specified'.[1]