1. Division of Pediatric Rheumatology, Loma Linda University Medical Center, Loma Linda, CA, USA
2. University of Texas Southwestern Medical School, Dallas, TX, USA
3. Department of Health and Kinesiology, Texas A&M University, College Station, TX, USA
4. Division of Rheumatic Diseases, University of Texas Southwestern Medical Center, Dallas, TX, USA
5. Division of Pediatric Rheumatology, University of Texas Southwestern Medical Center, Dallas, TX, USA
6. Pediatric Rheumatology, Texas Scottish Rite Hospital for Children, Dallas, TX, USA
7. Medical Service, VA North Texas Health Care System, Dallas, TX, USA