1. Department of Internal Medicine, University of Missouri and Harry S Truman Memorial Veterans' Hospital, Columbia, MO 65212
2. Department of Internal Medicine and Chief, Division of Immunology and Rheumatology, University of Missouri, Columbia, MO 65212
3. Antinuclear Antibody Laboratory, University of Missouri, Columbia, MO 65212
4. Department of Medicine, Institute of Molecular Medicine and Genetics, Medical College of Georgia, Augusta, GA 30912
5. Department of Molecular Pathology, University College London Medical School, 46 Cleveland Street, London W1P 6DB, UK
6. Rheumatology Section, Harry S Truman Memorial Veterans' Hospital and Department of Internal Medicine, University of Missouri, Columbia, MO 65201