1. Division of Rheumatology and Immunology, Department of Medicine, Vanderbilt University Medical Center , Nashville, TN, USA
2. Department of Medicine, Tennessee Valley Health Care System, Veterans Affair Medical Center , Nashville, TN, USA
3. Division of Rheumatology, Department of Medicine, University of Texas Health Science Center at Houston , Houston, TX, USA
4. Division of Rheumatology, Department of Medicine, Hospital for Special Surgery , New York City, NY, USA
5. Division of Rheumatology, Department of Medicine, Columbia University Irving Medical Center, Vagelos College of Physicians and Surgeons , New York, NY, USA
6. Department of Medicine, Georgetown University Medical Center , Washington, DC, USA
7. Division of Rheumatology, Department of Medicine, Johns Hopkins University , Baltimore, MD, USA
8. Division of Rheumatology, Department of Medicine, Northwestern University , Chicago, IL, USA
9. Division of Rheumatology, Department of Medicine, University of Michigan , Ann Arbor, MI, USA
10. Division of Rheumatology, Department of Medicine, Massachusetts General Hospital , Boston, MA, USA
11. Division of Immunology and Rheumatology, Department of Medicine, Stanford University and Palo Alto VA Health Care System , Palo Alto, CA, USA
12. Division of Rheumatology, Department of Medicine, Medical University of South Carolina , Charleston, SC, USA
13. Department of Anatomy, George Washington University, The George Washington University School of Medicine and Health Sciences , Washington, DC, USA
14. Division of Pediatric Critical Care, Department of Pediatrics, University of Utah , Salt Lake City, UT, USA
15. Division of Rheumatology and Immunology, Department of Medicine, Duke University , Durham, NC, USA
16. Division of Rheumatology, Department of Internal Medicine, Mayo Clinic , Rochester, MN, USA
17. Division of Rheumatology, Department of Internal Medicine, University of Utah , Salt Lake City, UT, USA
18. Division of Rheumatology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles , CA, USA
19. Division of Rheumatic and Autoimmune Diseases, Department of Medicine, University of Minnesota , Minneapolis, MN, USA
20. Division of Rheumatology, Department of Medicine, University of Pennsylvania , Philadelphia, PA, USA