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Associated Press
FILE - In this April 15, 2013 photo, an injured person is helped on the sidewalk near the Boston Marathon finish line following an explosion in Boston. The bombs that made Boston look like a combat zone have also brought battlefield medicine to their civilian victims. A decade of wars in Iraq and Afghanistan has sharpened skills and scalpels, leading to dramatic advances that are now being used to treat the 13 amputees and nearly a dozen other patients still fighting to keep damaged limbs. (AP Photo/MetroWest Daily News, Ken McGagh, File)  MANDATORY CREDIT

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