1. University of Nebraska Medical Center, Omaha; and Marmara University; Istanbul Turkey
2. Medical University of South Carolina; Charleston
3. University of Nebraska Medical Center and Veterans Affairs Nebraska-Western Iowa Health Care System; Omaha
4. National Data Bank for Rheumatic Diseases; Wichita Kansas
5. University of Nebraska Medical Center, Omaha; and National Data Bank for Rheumatic Diseases; Wichita Kansas