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Date: 2014-08-06 11:47:41Concussion grading systems Neurotrauma Concussion Head injury | Natomas Unified School District Concussion Information for Student-Athletes and Parents What is a Concussion…? A concussion is a brain injury caused by a bump, blow or jolt to the head. Did you know…? Athletes who haDocument is deleted from original location. Download Document from Web Archive |