1. Children’s National Health System, Washington, DC2Department of Pediatrics, George Washington University School of Medicine and Health Sciences, Washington, DC3Department of Emergency Medicine, George Washington University School of Medicine and Health Sc
2. Department of Emergency Medicine, University of California Davis School of Medicine, Sacramento5Department of Pediatrics, University of California Davis School of Medicine, Sacramento
3. Milken Institute School of Public Health, Department of Epidemiology and Biostatistics, George Washington University, Washington, DC