From the Population Health Research Institute, McMaster University-Hamilton Health Sciences (M.W.), and the Departments of Medicine (M.W., N.K.) and Health Research Methods, Evidence, and Impact (M.W.), McMaster University, and St. Joseph's Healthcare (M.W., N.K., A.M.), Hamilton, ON, the Division of Nephrology and the Li Ka Shing Knowledge Institute, St. Michael's Hospital (R.W.), and the Department of Medicine (R.W.), the Vasculitis Clinic, Department of Rheumatology (C.P., S.C.), and Mount Sinai Hospital, Division of Rheumatology (C.P., S.C.), University of Toronto, Toronto, the Department of Medicine, University of Calgary, Calgary, AB (L.P.G.), the Department of Medicine, University of British Columbia, Vancouver (A.L.), and the Department of Medicine, University of Western Ontario, London (W.F.C.) - all in Canada; the Division of Rheumatology, Departments of Medicine and Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Philadelphia (P.A.M., C.A.M.); Royal Adelaide Hospital and the University of Adelaide, Adelaide (C.-A.P.), and the Australasian Kidney Trials Network, University of Queensland, Brisbane (C.M.H., D.R.) - all in Australia; Rigshospitalet University Hospital, Department of Nephrology, Copenhagen (W.M.S.); Assistance Publique-Hôpitaux de Paris, Hôpital Cochin, Université Paris Descartes, Paris (X.P., L.G.); the Faculty of Medicine, University of Miyazaki, Miyazaki (S.F.), and the Institute for Advancement of Clinical and Translational Science, Kyoto University Hospital, and the Clinical and Translational Research Center, University Hospital, Kyoto Prefectural University of Medicine, Kyoto (T.I.-I.) - all in Japan; Royal Berkshire Hospital, Reading (O.F.), the Institute of Clinical Sciences (L.H.) and the Birmingham Clinical Trials Unit, Institute of Applied Health Research (S.M., N.I.), University of Birmingham, Birmingham, the Royal Devon and Exeter NHS Foundation Trust, Exeter (L.S.), the Department of Medicine, Imperial College London (C.D.P.), and Guys and St. Thomas' NHS Foundation Trust (A.L.C.), London, and the Department of Medicine, University of Cambridge (B.B., E.B., D.R.W.J.), and Addenbrooke's Hospital (D.R.W.J.), Cambridge - all in the United Kingdom; Spedali Civili di Brescia, Università di Brescia, Brescia, Italy (G.G.); the Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN (U.S.); the Department of Nephrology, General University Hospital, Charles University, Prague, Czech Republic (V.T.); the Renal Service, Waitemata District Health Board, and the Department of Medicine, University of Auckland, Auckland, New Zealand (J.R.Z.); Jagiellonian University Medical College, Krakow, Poland (W.S.); and the Primary Systemic Vasculitides Clinic, Instituto Nacional de Enfermedades Respiratorias, Mexico City (L.F.F.-S.).