[1] Children’s Hospital of Philadelphia,Division of Rheumatology
[2] Children’s Hospital of Philadelphia Research Institute,Center for Pediatric Clinical Effectiveness
[3] University of Pennsylvania Perelman School of Medicine,Department of Pediatrics
[4] University of Pennsylvania Perelman School of Medicine,Department of Biostatistics, Epidemiology and Informatics
[5] Children’s Hospital of Philadelphia,Office of Clinical Quality Improvement
[6] University of Pennsylvania,Center for Pharmacoepidemiology Research and Training