1. From the Department of Medicine, University of North Carolina School of Medicine at Chapel Hill, and Thurston Arthritis Research Center, Chapel Hill (B.L.J.), and the Department of Medicine, Duke University School of Medicine, Durham (L.G.C.-S.) — all in North Carolina; and the Departments of Radiology (R.B.R.), Medicine (P.W.C.), and Pathology (C.T.-A.), Massachusetts General Hospital, and the Departments of Radiology (R.B.R.), Medicine (P.W.C.), and Pathology (C.T.-A.), Harvard Medical School —...