As many as one in 10 high school football players suffer a concussion each year, experts say. But little is known about long-term medical risks.
msnbc.com: Top msnbc.com headlines, NBC News
Fri, 10/30/2009 - 12:31pm
As many as one in 10 high school football players suffer a concussion each year, experts say. But little is known about long-term medical risks.