Doctor says violence is a contagious health problem, and can be cured

Chicago homicide
A teenage boy grieves next to a makeshift memorial at the site where Ashley Hardmon was shot and killed on July 4th, 2013 in Chicago, Illinois. Hardmon, 19, was killed after being struck in the head by a bullet when two men opened fire on her and a group of friends on July 2nd.
Scott Olson/Getty Images
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