San Francisco 49ers quarterback Alex Smith is shown on the ground after being hit during the first quarter of an NFL football game against the St. Louis Rams in San Francisco, Sunday, Nov. 11, 2012. In the background is San Francisco 49ers tackle Anthony Davis at left and at right is St. Louis Rams linebacker Mario Haggan. Smith later left the game. (AP Photo/Jeff Chiu)

Associated Press
San Francisco 49ers quarterback Alex Smith is shown on the ground after being hit during the first quarter of an NFL football game against the St. Louis Rams in San Francisco, Sunday, Nov. 11, 2012. In the background is San Francisco 49ers tackle Anthony Davis at left and at right is St. Louis Rams linebacker Mario Haggan. Smith later left the game. (AP Photo/Jeff Chiu)
San Francisco 49ers quarterback Alex Smith is shown on the ground after being hit during the first quarter of an NFL football game against the St. Louis Rams in San Francisco, Sunday, Nov. 11, 2012. In the background is San Francisco 49ers tackle Anthony Davis at left and at right is St. Louis Rams linebacker Mario Haggan. Smith later left the game. (AP Photo/Jeff Chiu)
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