1. VA Nebraska–Western Iowa Health Care System and University of Nebraska Medical Center Omaha
2. University of Nebraska Medical Center Omaha
3. University of Nebraska, Omaha, and Vienna University of Economics and Business Vienna Austria
4. University of Nebraska Omaha
5. University of Utah and Veterans Affairs Salt Lake City Salt Lake City
6. Philadelphia Veterans Affairs and University of Pennsylvania Philadelphia
7. University of Alabama Birmingham
8. University of Nebraska Medical Center, Omaha, and FORWARD, The National Databank for Rheumatic Diseases Wichita, Kansas