NFL concussion fallout raises red flags in NASCAR (AP)

[unable to retrieve full-text content]AP - Michael Waltrip doesn't have an exact count of the concussions he has sustained over his NASCAR career. He knows it's more than 10.

Source: http://us.rd.yahoo.com/dailynews/rss/sports/*http%3A//news.yahoo.com/s/ap/20120221/ap_on_sp_au_ra_ne/car_nascar_daytona500_concussions

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