IGHA1 and Henoch-Schoenlein purpura: Tang Tang M M Zhang Zhang X X Li Li X X Serum levels of galactose-deficient IgA1 in Chinese children with IgA nephropathy, IgA vasculitis with nephritis, and IgA vasculitis Serum levels of galactose-deficient IgA1 in Chinese children with IgA nephropathy, IgA vasculitis with nephritis, and IgA vasculitis Clin Exp Nephrol Clin Exp Nephrol 2021 2021 25 25 37 37 43 43 10.1007/s10157-020-01968-8 10.1007/s10157-020-01968-8 supplied-pmid 32935202?