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Prognostic value of a new cardiopulmonary exercise testing parameter in chronic heart failure: oxygen uptake efficiency at peak exercise — comparison with oxygen uptake efficiency slope Alexandra Toste, Rui Soares, Joana Feliciano, Valeska Andreozzi, Sofia Silva, Ana Abreu, Ruben Ramos, Ninel Santos, Lurdes Ferreira, Rui Cruz Ferreira

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