| Affiliation: | 1. Division of Oncology, The Children's Hospital of Philadelphia, , Philadelphia, Pennsylvania;2. Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, , Philadelphia, Pennsylvania;3. Center for Pharmacoepidemiology Research and Training, Perelman School of Medicine at the University of Pennsylvania, , Philadelphia, Pennsylvania;4. Center for Pediatric Clinical Effectiveness, The Children's Hospital of Philadelphia, , Philadelphia, Pennsylvania;5. Perelman School of Medicine at the University of Pennsylvania, , Philadelphia, Pennsylvania;6. Division of Infectious Diseases, The Children's Hospital of Philadelphia, , Philadelphia, Pennsylvania;7. Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, , Philadelphia, Pennsylvania |
