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Andreas_RebmannThey use aggregated interviews wherein all or many of the survivors repeat the same issues with long term effects of the disaster.
They also study the socioeconomic longterm effects of the disaster by comparing New Orleans years later to the past, showing how permanent an effect the storm had despite eventual recovery.
They also used sociological surveys that showed widespread mental health disorders that developed throughout the survivor population in greater frequency than that of the normal population due to the events that occured.