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FILE - In this Nov. 19, 2014, file photo, Dr. Robert Stern of Boston University poses for a photograph outside the U.S. Courthouse after a hearing on the proposed NFL concussion settlement in Philadelphia. A preliminary study by Boston University researchers shows a link between the number of hits a player takes in youth, high school and college football and the development of cognitive difficulties as an adult. Dr. Robert Stern of the BU School of Medicine says the study is the first of its kind to look at the connection between the total number of head impacts an athlete sustained and later-in-life difficulties such as depression, apathy and behavioral dysfunction. But he stressed it is meant to spur further research and not guide individuals when deciding whether football is safe for them. (AP Photo/Matt Rourke, File)
Associated Press | March 31, 2016 11:01 am
Study: Amateur football hits linked to later-life difficulty