The number of child-athletes taken to emergency rooms (emergency departments) with concussion in the USA more than tripled, from 7,000 cases in 1997 to nearly 22,000 in 2007, according to an article published in the medical journal Pediatrics. The authors believe this is due to a greater awareness of head injuries, and possibly because sports have become more intense. Even though awareness has improved, the authors stress that a significant number of children with concussion are never referred to a medical professional, so figures are probably much higher than the officially reported ones... 
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