Many professional sports have supportive alliances with youth sports. Learn how the CDC helps.
Produced by Vicky Youcha and Ashley Gilleland, BrainLine.
Marlena M. Wald, MPH, MLS is an epidemiologist in the Division of Injury Response in the National Center for Injury Control and Prevention (NCIPC). Her areas of research include acute care, traumatic brain injury, and substance issues related to both of these topics.