1. Philadelphia Veterans Affairs Medical Center, Philadelphia, Pennsylvania and University of Pennsylvania Philadelphia
2. Veterans Affairs Nebraska‐Western Iowa Health Care System Omaha Nebraska
3. Veterans Affairs Nebraska‐Western Iowa Health Care System, Omaha, Nebraska University of Nebraska Medical Center Omaha
4. University of Nebraska Medical Center Omaha
5. Salt Lake City Veterans Affairs Medical Center, Salt Lake City, Utah and University of Utah Salt Lake City
6. University of Pennsylvania Philadelphia
7. University of Nebraska Medical Center, Omaha and the National Data Bank for Rheumatic Diseases Wichita Kansas