1. Department of Internal Medicine, Division of Rheumatology and Immunology, Tennessee Valley Health Care System, Veterans Affairs Medical Center and Vanderbilt University Medical Center , Nashville, TN, USA
2. Clinical and Translational Science Institute, University of Utah , Salt Lake City, UT, USA
3. Molecular Medicine Program, University of Utah , Salt Lake City, UT, USA
4. Department of Pathology, University of Utah , Salt Lake City, UT, USA
5. Study Design and Biostatistics Center, University of Utah , Salt Lake City, UT, USA
6. Department of Internal Medicine, George E. Wahlen Veterans Affairs Medical Center , Salt Lake City, UT, USA