1 Division of Rheumatology and Clinical Immunology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.
2 Department of Medicine, Division of Rheumatology, University of Washington, Seattle, Washington, USA.
3 Medicine/Rheumatology, Washington University in Saint Louis School of Medicine, Saint Louis, Missouri, USA jsparks@bwh.harvard.edu akim@wustl.edu.
4 Division of Rheumatology, Inflammation, and Immunity, Brigham and Women's Hospital, Boston, Massachusetts, USA jsparks@bwh.harvard.edu akim@wustl.edu.