1. From the Departments of Radiology (L.B.O.J., M.C., N.H.) and Rheumatology (D.E., F.V.d.B., P.C., P.J., R.W.), Ghent University Hospital, Corneel Heymanslaan 10, 9000 Ghent, Belgium; VIB Center for Inflammation Research, Unit for Molecular Immunology and Inflammation, Ghent University, Ghent, Belgium (D.E., F.v.d.B., P.C., P.J., R.W.); and Department of Radiology & Diagnostic Imaging, University of Alberta Hospital, Edmonton, Canada (J.L.J.).