1. Department of Pediatrics, Division of Infectious Diseases, Children’s Hospital of Philadelphia , Philadelphia, Pennsylvania , USA
2. Department of Pediatrics, Division of Infectious Diseases, Baylor College of Medicine , Houston, Texas , USA
3. Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania Perelman School of Medicine , Philadelphia, Pennsylvania , USA
4. Department of Pediatrics, University of Pennsylvania Perelman School of Medicine , Philadelphia, Pennsylvania , USA
5. Pediatric IDEAS Research Group of the Center for Pediatric Clinical Effectiveness , USA