| Affiliation: | 1. Veterans Affairs Nebraska–Western Iowa Health Care System, and University of Nebraska Medical Center, Omaha;2. Veterans Affairs Nebraska–Western Iowa Health Care System, University of Nebraska Medical Center, Omaha, and National Data Bank for Rheumatic Diseases, Wichita, Kansas;3. Denver VAMC and University of Colorado, Denver;4. Denver VAMC, University of Colorado, and Denver Health Medical Center, Denver, Colorado;5. Veterans Affairs Salt Lake City Health Care System and University of Utah School of Medicine, Salt Lake City;6. Dallas Veterans Affairs and University of Texas Southwestern, Dallas;7. Washington, DC, Veterans Affairs Medical Center and Georgetown and Howard Universities, Washington, DC;8. Portland Veterans Affairs Health Care System and Oregon Health and Sciences University, Portland;9. Philadelphia VAMC and University of Pennsylvania School of Medicine, Philadelphia |
