1. Department of Pediatrics; University of Pennsylvania Perelman School of Medicine; Philadelphia PA
2. Division of Emergency Medicine and Center for Pediatric Clinical Effectiveness; Children's Hospital of Philadelphia; Philadelphia PA
3. Department of Pediatrics; Northwestern University Feinberg School of Medicine and Division of Emergency Medicine; Ann and Robert H. Lurie Children's Hospital of Chicago; Chicago IL
4. Center for Biomedical Informatics; Children's Hospital of Philadelphia; Philadelphia PA
5. Department of Anesthesia and Critical Care; University of Pennsylvania Perelman School of Medicine; Philadelphia PA
6. Division of Critical Care; Children's Hospital of Philadelphia; Philadelphia PA
7. Center for Clinical Epidemiology and Biostatistics; University of Pennsylvania Perelman School of Medicine; Philadelphia PA
8. Department of Medicine; Division of Infectious Diseases; University of Pennsylvania Perelman School of Medicine; Philadelphia PA