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Characterization of hospitalized patients with acute kidney injury associated with COVID-19 in Spain: renal replacement therapy and mortality. FRA-COVID SEN Registry Data M. Salgueira; M. Almenara; A. Gutierrez-Pizarraya; L. Belmar; P.J. Labrador; R. Melero; M. Serrano; J.M. Portolés; A. Molina; E. Poch; N. Ramos; M.J. Lloret; R. Echarri; R. Díaz-Mancebo; D.M. González- Lara; J.E. Sánchez; M.J. Soler;