Contribution of cardiopulmonary exercise testing to the identification of latent systolic dysfunction in chronic aortic regurgitation - De Santi, Giovani Luiz; Carvalho, Eduardo Elias Vieira de; Costa, Daniela Caetano; Crescencio, Júlio César; Romano, Minna Moreira Dias; Schmidt, Andre; Simões, Marcus Vinicius; Gallo Junior, Lourenço (Revista Portuguesa de Cardiologia, 2013)