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Heads up: is there a hidden concussion problem among athletes?

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Macalester football practice
Macalester College football players practice rushing the passer. Doctors are worried that the NFL practice of playing despite concussions is emulated by college and high school teams.
MPR photo/Jim Bickal
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Macalester football practice
Macalester College football players practice rushing the passer. Doctors are worried that the NFL practice of playing despite concussions is emulated by college and high school teams.
MPR photo/Jim Bickal