FILE - In this Nov. 8, 2009 file photo, a member of the Washington Redskins training staff, top, attends to running back Clinton Portis after he received a concussion in the first quarter of an NFL football game against the Atlanta Falcons in Atlanta. Thirty of 160 NFL players surveyed by The Associated Press from Nov. 2-15 said they have hidden the symptoms or effects of a concussion so they could continue to play. Portis was not surveyed by the AP. (AP Photo/John Amis, File)AP – Washington Redskins kick returner Rock Cartwright remembers his brain “shaking like a bell” when he was walloped in a game against the New York Giants a few years ago.

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