1. Division of Rheumatology Children's Hospital of Philadelphia Philadelphia PA USA
2. Center for Pediatric Clinical Effectiveness Children's Hospital of Philadelphia Research Institute Philadelphia PA USA
3. Department of Pediatrics University of Pennsylvania Perelman School of Medicine Philadelphia PA USA
4. Division of Cardiology Children's Hospital of Philadelphia Philadelphia PA USA
5. Department of Biostatistics, Epidemiology and Informatics University of Pennsylvania Perelman School of Medicine Philadelphia PA USA
6. Division of Nephrology Children's Hospital of Philadelphia Philadelphia PA USA
7. Division of Rheumatology Hospital for Sick Children Toronto ON Canada
8. SickKids Research Institute Hospital for Sick Children Toronto ON Canada
9. Department of Paediatrics Faculty of Medicine University of Toronto Toronto ON Canada
10. Center for Pharmacoepidemiology Research and Training University of Pennsylvania Philadelphia PA USA