Affiliation: | 1. Division of Oncology, The Children's Hospital of Philadelphia, , Philadelphia, Pennsylvania;2. Division of Infectious Diseases, The Children's Hospital of Philadelphia, , Philadelphia, Pennsylvania;3. Center for Pediatric Clinical Effectiveness, The Children's Hospital of Philadelphia, , Philadelphia, Pennsylvania;4. Department of Biostatistics and Epidemiology, The Perelman School of Medicine, The University of Pennsylvania, , Philadelphia, Pennsylvania;5. Children's Hospital Association, , Overland Park, Kansas;6. Bristol‐Myers Squibb, , Pennington, New Jersey |