A case series of diffuse crescenic IgA nephropathy: an omitted entity in the Oxford classification - Silva, Gyl Eanes Barros; Costa, Roberto Silva; Lobato, Edienny Tocantins Viana; Salgado, João Victor; Vieira Neto, Osvaldo Merege; Moyses Neto, Miguel; Dantas, Márcio (International Journal of Clinical and Experimental Pathology, 2016)