Measurement of galactosyl-deficient IgA1 by the monoclonal antibody KM55 contributes to predicting patients with IgA nephropathy with high risk of long-term progression Luis Martín-Penagos; Gema Fernández-Fresnedo; Adalberto Benito-Hernández; Jaime Mazón; Marina de Cos; María Victoria Oviedo; David San Segundo; Marcos López-Hoyos; Javier Gómez-Román; Juan Carlos Ruiz; Emilio Rodrigo;