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By Lois Beckett, ProPublica 

A shooting victim is rushed to the hospital in Miami. Photo: CBS4

A shooting victim is rushed to the hospital in Miami. Photo: CBS4

Chicago’s Cook County Hospital has one of the busiest trauma centers in the nation, treating about 2,000 patients a year for gunshots, stabbings and other violent injuries.

So when researchers started screening patients there for post-traumatic stress disorder in 2011, they assumed they would find cases.

They just didn’t know how many: Fully 43 percent of the patients they examined – and more than half of gunshot-wound victims – had signs of PTSD.