1. Division of Rheumatology University of Colorado School of Medicine Aurora Colorado USA
2. Department of Epidemiology Colorado School of Public Health Aurora Colorado USA
3. Division of Rheumatology, Allergy and Immunology University of California San Diego La Jolla California USA
4. Benaroya Research Institute Seattle Washington USA
5. Division of Immunology and Rheumatology Stanford University Stanford California USA
6. Department of Medicine, Division of Rheumatology VA Palo Alto Health Care System Palo Alto California USA