Serum cystatin C as an early marker of Acute Kidney Injury in elderly patients after surgery for femur fracture. An observational study by José de Souza Andrade Neto, MD, PhD, Vera Lucia Fernandes de Azevedo, MD, PhD, Italo Lopes, Carvalho, MD, Reinaldo da Silva Santos Junior, MD, MsC, Paulo do Nascimento Junior, MD, PhD, Norma Sueli Pinheiro Modolo, MD, PhD

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