1. Division of Emergency Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago; Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
2. Department of Bioinformatics and Biostatistics, University of Louisville, Louisville, KY, USA
3. Department of Pediatrics, University of Cincinnati College of Medicine, Division of Emergency Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
4. Department of Pediatrics, The University of Pennsylvania Perelman School of Medicine; Division of Infectious Diseases, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
5. Departments of Emergency Medicine and Pediatrics, University of California, Davis School of Medicine and UC Davis Health, Sacramento, CA, USA