1. Department of Medicine, Durham Veterans Affairs Healthcare System, Durham, North Carolina, USA.
2. Division of Rheumatology, Department of Medicine, Duke University, Durham, North Carolina, USA.
3. Department of Medicine and Pediatrics, Division of Rheumatology, Duke University, Durham, North Carolina, USA.
4. VA Central Western Massachusetts VA Healthcare System, Leeds, Massachusetts, USA.
5. Department of Population and Quantitative Health Sciences, University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA.
6. Division of Internal Medicine, Duke University School of Medicine, Durham, North Carolina, USA.
7. Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina, USA.