Integrating nephron number into risk stratification for IgA nephropathy. - Yamaguchi Y; Sasaki T; Tsuboi N; Marumoto H; Okabayashi Y; Haruhara K; Kanzaki G; Koike K; D'Agati VD; Bertram JF; Ninomiya T; Yokoo T (Clinical and experimental nephrology, 2026)