1 From the Department of Medicine, Sinai Health System and University Health Network (L.G., A.S.D., R.P.R.), the Joint Department of Medical Imaging (L.A.F.), the Department of Medicine (L.G., A.S.D., R.P.R.), and Institute of Health Policy, Management and Evaluation (A.S.D.), University of Toronto, and the Division of Rheumatology, Salvation Army Toronto Grace Health Centre (R.P.R.) - all in Toronto.