Serum potassium levels provide prognostic information in symptomatic heart failure beyond traditional clinical variables oleh Camila Cristiane Toledo, Pedro Vellosa Schwartzmann, Luis Miguel Silva, Gabriel daSilva Ferreira, Fernando Bianchini Cardoso, Vinicius Citelli Ribeiro, Layde Rosane Paim, Lígia M. Antunes‐Correa, Andrei Carvalho Sposito, Jose Roberto Matos Souza, Rodrigo Modolo, Wilson Nadruz, Luis Sergio Fernandes de Carvalho, Otávio R. Coelho‐Filho