1. Philadelphia VA Medical Center and University of Pennsylvania; Philadelphia
2. University of Pennsylvania; Philadelphia
3. Nebraska−Western Iowa VA Medical Center, Omaha, Nebraska, University of Nebraska Medical Center, Omaha and National Data Bank for Rheumatic Diseases; Wichita Kansas
4. Denver VA Medical Center; Denver Colorado
5. Salt Lake City VA Medical Center, Salt Lake City, Utah and University of Utah; Salt Lake City
6. Boston University School of Public Health; Boston Massachusetts
7. G. V. (Sonny) Montgomery VA Medical Center, Montgomery, Mississippi and University of Mississippi Medical Center; Jackson
8. Nebraska-Western Iowa VA Medical Center, Omaha, Nebraska and University of Nebraska Medical Center; Omaha