1. Department of Nephrology and Hypertension, Kawasaki Medical School, Kurashiki, Okayama, Japan (K.K., H.N., M.S., E.K., T.S., N.K.).
2. Division of Nephrology, Department of Medicine (D.Z.I.C.), University Health Network, University of Toronto, Canada.
3. Department of Laboratory Medicine and Pathology (A.B.), University Health Network, University of Toronto, Canada.