1 Department of Medicine, Division of Rheumatology and Immunology, Duke University School of Medicine, Durham, NC.
2 Department of Medicine, Division of Rheumatology and Immunology, Duke University School of Medicine, Durham, NC; Department of Medicine, Veterans Affairs Medical Center, Durham, NC.
3 Department of Medicine, Division of Rheumatology and Immunology, Duke University School of Medicine, Durham, NC; Department of Biochemistry, Duke University School of Medicine, Durham, NC. Electronic address: michael.hershfield@duke.edu.