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NEW YORK, NY - AUGUST 19:  Guns seized by the New York Police Department (NYPD), in the largest seizure of illegal guns in the city's history, are displayed on a table during a press conference on August 19, 2013 in New York City. The operation, which involved an undercover agent buying guns that were smuggled from North Carolina and South Carolina, yielded over 250 guns. ninteen people have been charged in the operation.  (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - AUGUST 19:  Guns seized by the New York Police Department (NYPD), in the largest seizure of illegal guns in the city's history, are displayed on a table during a press conference on August 19, 2013 in New York City. The operation, which involved an undercover agent buying guns that were smuggled from North Carolina and South Carolina, yielded over 250 guns. ninteen people have been charged in the operation.  (Photo by Andrew Burton/Getty Images)

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Doctors press for gun violence research

A group of doctors delivered a petition to Congress asking them to lift restrictions on gun violence research in the U.S.

Doctors press for gun violence research

A group of doctors delivered a petition to Congress asking them to lift restrictions on gun violence research in the U.S.