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Melissa Stockwell is a pediatrician and a professor of population and family health at Columbia University Irving Medical Center.

The more frequently a player headed the ball, the more damage they had, and the worse they performed on cognitive tests, said Michael Lipton, a professor of radiology at Columbia University.

Editor's Note: Edith Bracho-Sanchez, interviewed here, is an assistant professor of pediatrics at the Columbia University Vagelos College of Physicians and Surgeons.