| http://www.w3.org/ns/prov#value | - ma once said he???d ???have to think long and hard??? before allowing a son to play football because of the risk of head injury.At the summit, Obama will also highlight millions of dollars in pledges and other support from the NFL, the National Institutes of Health and others to conduct research that could begin to provide answers and improve safety.???He, as a parent, is concerned about the safet
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