1. Department of Family Medicine, University of North Carolina at Chapel Hill2Injury Prevention Research Center, University of North Carolina at Chapel Hill
2. Department of Pediatrics, Kempe Center, University of Colorado, Aurora
3. Injury Prevention Research Center, University of North Carolina at Chapel Hill4Department of Maternal and Child Health, University of North Carolina at Chapel Hill
4. Department of Public Policy, University of North Carolina at Chapel Hill
5. Injury Prevention Research Center, University of North Carolina at Chapel Hill
6. Center for Child and Family Health, Durham, North Carolina
7. Division of Violence Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia
8. Center for Child and Family Health, Durham, North Carolina8Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, North Carolina
9. National Center on Shaken Baby Syndrome, Farmington, Utah
10. Child and Family Research Institute, University of British Columbia, Vancouver, British Columbia, Canada11Canadian Institute for Advanced Research, Toronto, Ontario, Canada