Kansas City Chiefs quarterback Brady Quinn (9) is tackled by Oakland Raiders defensive tackle Tommy Kelly (93) during the first half of an NFL football game at Arrowhead Stadium in Kansas City, Mo., Sunday, Oct. 28, 2012. Quinn left the game during the first quarter due to what the team called a "head injury." (AP Photo/Reed Hoffmann)

Associated Press
Kansas City Chiefs quarterback Brady Quinn (9) is tackled by Oakland Raiders defensive tackle Tommy Kelly (93) during the first half of an NFL football game at Arrowhead Stadium in Kansas City, Mo., Sunday, Oct. 28, 2012. Quinn left the game during the first quarter due to what the team called a "head injury." (AP Photo/Reed Hoffmann)
Kansas City Chiefs quarterback Brady Quinn (9) is tackled by Oakland Raiders defensive tackle Tommy Kelly (93) during the first half of an NFL football game at Arrowhead Stadium in Kansas City, Mo., Sunday, Oct. 28, 2012. Quinn left the game during the first quarter due to what the team called a "head injury." (AP Photo/Reed Hoffmann)
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