1 Center for Injury Research and Prevention, Children's Hospital of Philadelphia, Pittsburgh, Pennsylvania; Minds Matter Concussion Program, Children's Hospital of Philadelphia, Pittsburgh, Pennsylvania; Perelman School of Medicine, University of Pennsylvania, Pittsburgh, Pennsylvania.
2 Center for Injury Research and Prevention, Children's Hospital of Philadelphia, Pittsburgh, Pennsylvania; Minds Matter Concussion Program, Children's Hospital of Philadelphia, Pittsburgh, Pennsylvania; School of Nursing, University of Pennsylvania, Pittsburgh, Pennsylvania; Penn Injury Science Center, University of Pennsylvania, Pittsburgh, Pennsylvania.