1. Center for Health Measurement Department of Population Health Sciences Duke University School of Medicine Durham NC USA
2. Division of Rheumatology Departments of Pediatrics and Medical Social Sciences Ann & Robert H. Lurie Children's Hospital of Chicago/Northwestern University Feinberg School of Medicine Chicago IL USA
3. Northwestern University Feinberg School of Medicine Chicago IL USA
4. Department of Psychological Sciences Case Western Reserve University Cleveland OH USA
5. Behavioral and Community Health Services Public Health University of Pittsburgh Pittsburgh PA USA
6. Division of Rheumatology Department of Pediatrics Children's Hospital of Pittsburgh of UPMC Pittsburgh PA USA