Incidence and risk factors for acute kidney injury after cardiac surgery in a Brazilian University Hospital: a retrospective cross-sectional study - Pedro Victor Fernandes Ferreira; Heitor J.S. Medeiros; Hugo de Santana Ribeiro Dantas; Eduardo Venancio Teixeira; Lucas Pereira Trevisan; Fernanda de Castro Teixeira; Fernanda Cunha Soares; Raphael Klênio Confessor de Souza; Wallace Andrino da Silva (Brazilian Journal of Anesthesiology)