Colin Kaepernick
 AP Photo/Ross D. Franklin
Cardinals safety Tony Jefferson was diagnosed

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The Chargers originally missed signs of Jahleel Addae's concussion. (USATSI)The Chargers originally missed signs of Jahleel Addae’s concussion. (USATSI) 

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 Roger Goodell

Roger Goodell (WikiImages)

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jordancameron

AP

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Brandon Flowers suffered a concussion on a helmet-to-helmet hit with Jamaal Charles. (Jake Roth / USA Today)

 

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(AP Photo/Matt Rourke)

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 Paul Oliver

 

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(Todd Bennett/GettyImages)

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Andy Lyons/Getty Images

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Lewis

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 Carolina Panthers v Cincinnati Bengals

Marvin  Lewis               Getty Images

 

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Joe Amon/The Denver Post via Getty Images

Drew Stanton, backup quarterback for the Arizona Cardinals,

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