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Twelve years ago this month, Hurricane Katrina devastated New Orleans and much of the rest of the Gulf Coast, killing some 1,500 people and displacing more than a million others. Six years later, when an earthquake and tsunami hit eastern Japan in 2011, about 18,500 people lost their lives, and another 345,000 lost their homes, some permanently.
Researchers have found that disaster survivors often suffer from a range of…