Christina L Master1, Andrew R Mayer, Matthew F Grady. 1. 1Division of Pediatric Orthopedics, Sports Medicine and Performance Center, Pediatric and Adolescent Sports Medicine, Perelman School of Medicine at the University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, PA; 2Departments of Neurology, Psychiatry, Psychology, University of New Mexico School of Medicine, Albuquerque, NM.