1. Division of Rheumatology, Department of Medicine, Mount Auburn Hospital, Cambridge, Massachusetts, USA
2. Assistant Professor of Medicine, Harvard Medical School, Boston, Massachusetts, USA
3. Department of Medicine, Mount Auburn Hospital, Cambridge, Massachusetts, USA
4. Clinical Fellow in Medicine, Harvard Medical School, Boston, Massachusetts, USA
5. Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
6. Department of Health Sciences, Northeastern University, Boston, Massachusetts, USA
7. Division of Rheumatology, Department of Medicine and Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
8. Division of Rheumatology, Department of Medicine at Corporal Michael J. Crescenz VA Medical Center, Philadelphia, Pennsylvania, USA