1. From the Institute for Clinical Evaluative Sciences (J.C.K., K.L.S., M.A.C., H.C., D.T.K., L.C.R.), Public Health Ontario (J.C.K., K.L.S., N.S.C., L.C.R., J.B.G.), Dalla Lana School of Public Health (J.C.K., K.L.S., N.S.C., A.J.M., L.C.R.), and the Departments of Family and Community Medicine (J.C.K.) and Laboratory Medicine and Pathobiology (N.S.C., K.K., A.J.M., A.S., J.B.G.), University of Toronto, University Health Network (J.C.K.), North York General Hospital (K.K.), Sunnybrook Health Sciences...