1. The Warren Alpert Medical School, Brown University, Providence, Rhode Island;
2. Departments of Emergency Medicine and Pediatrics, Warren Alpert Medical School of Brown University, Providence, Rhode Island;
3. Center for Injury Research and Prevention, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania;
4. Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania;
5. School of Nursing, University of Pennsylvania, Philadelphia, Pennsylvania