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Congenital porto-systemic shunt: An uncommon cause of membranoproliferative glomerulonephritis Carlos Santos-Alonso; Begoña Rivas; Cristina Vega-Cabrera; Carmen Busca Arenzana; Laura Yébenes Gregorio; Marina Alonso Riaño; Eugenia García Fernández; M. Auxiliadora Bajo Rubio;