1. Department of Statistics, The Wharton School, University of Pennsylvania, Philadelphia
2. Brain Injury Neuropsychology Laboratory, Moss Rehabilitation Research Institute, Elkins Park, Pennsylvania
3. TBI Rehabilitation Research Laboratory, Moss Rehabilitation Research Institute, Elkins Park, Pennsylvania
4. Center for Demography and Ecology, University of Wisconsin–Madison
5. New York University, New York, New York
6. Standard Prevention Research Center, Stanford School of Medicine, Stanford University, Palo Alto, California
7. Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia8Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania, Philadelphia9Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia
8. Sports Medicine and Performance Center, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania11Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia