1. Department of Rheumatology, Park Nicollet Clinic and HealthPartners Institute, HealthPartners Inc Bloomington Minnesota
2. Division of Health Policy and Management University of Minnesota Minneapolis Minnesota
3. Division of Epidemiology and Community Health University of Minnesota Minneapolis Minnesota
4. Department of Medicine University of Minnesota Minneapolis Minnesota
5. Center for Care Delivery and Outcomes Research Veterans Administration Health Care System Minneapolis Minnesota
6. Department of Epidemiology, Graduate School of Public Health University of Pittsburgh Pittsburgh Pennsylvania