1. Center for Outcomes Research, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania2Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia3Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia4Department of Health Care Management, Wharton School, University of Pennsylvania, Philadelphia5Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia
2. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia6Department of Statistics, Wharton School, University of Pennsylvania, Philadelphia
3. Center for Outcomes Research, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
4. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia7Division of General Pediatrics, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
5. Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia8Division of Emergency Medicine, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania