Critically ill patients with COVID-19-associated acute kidney injury treated with kidney replacement therapy: comparison between the first and second pandemic waves in São Paulo, Brazil - Samaan, Farid; Freitas, Rafaela Andrade Penalva; Viana, Renata; Gambaro, Livia; Cunha, Karlla; Vieira, Tales Dantas; Feitosa, Valkercyo; Correa, Eric Aragao; Maciel, Alexandre Toledo; Burdmann, Emmanuel de Almeida (PLOS ONE, 2023)