Nfl

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Indianapolis Colts quarterback Andrew Luck (12) outruns Jacksonville Jaguars strong safety Dawan Landry (26) to score a touchdown during the second quarter of an NFL game Thursday, Nov. 8, 2012, in Jacksonville, Fla. (AP Photo/Phelan M. Ebenhack)

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Former Redskins cornerback Pat Fischer has recently joined the flood of concussion lawsuits against the NFL. (AP Photo)

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Washington Redskins head coach Mike Shanahan walks on the sidelines during the first half of an NFL football game against the Carolina Panthers Sunday, Nov. 4, 2012, in Landover, Md. (AP Photo/Nick Wass)

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New Orleans Saints running back Pierre Thomas (23) rushes as Philadelphia Eagles outside linebacker Mychal Kendricks (95) tries to tackle during the second half an NFL football game at the Mercedes-Benz Superdome in New Orleans, Monday, Nov. 5, 2012. (AP Photo/Bill Feig)

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Washington Redskins head coach Mike Shanahan yells on the sidelines during the first half of an NFL football game against the Carolina Panthers Sunday, Nov. 4, 2012, in Landover, Md. (AP Photo/Nick Wass)

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Atlanta Falcons running back Michael Turner (33) tries to get past Dallas Cowboys safety Danny McCray (40) during the second half of an NFL football game, Sunday, Nov. 4, 2012, in Atlanta. (AP Photo/Rich Addicks)

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Pittsburgh Steelers wide receiver Mike Wallace (17) and Isaac Redman (33) celebrate after Wallace scored a touchdown during the second half of an NFL football game against the New York Giants, Sunday, Nov. 4, 2012, in East Rutherford, N.J. The Steelers won 24-20. (AP Photo/Bill Kostroun)

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Carolina Panthers wide receiver Steve Smith (89) celebrates with running back Jonathan Stewart (28) and quarterback Cam Newton (1) after Smith's touchdown during the first half of an NFL football game against the Washington Redskins, Sunday, Nov. 4, 2012, in Landover, Md. (AP Photo/Richard Lipski)