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FILE - This Aug. 12, 2014 file photo shows safety helmets in a container in a pre-K classroom at an elementary school in Oklahoma. Comprehensive new children's concussion guidelines from the U.S. government released on Tuesday, Sept. 4, 2018, recommend against routine X-rays and blood tests for diagnosis and reassure parents that most kids' symptoms subside within one to three months. (AP Photo/Sue Ogrocki)

FILE - This Aug. 12, 2014 file photo shows safety helmets in a container in a pre-K classroom at an elementary school in Oklahoma. Comprehensive new children's concussion guidelines from the U.S. government released on Tuesday, Sept. 4, 2018, recommend against routine X-rays and blood tests for diagnosis and reassure parents that most kids' symptoms subside within one to three months. (AP Photo/Sue Ogrocki)

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