Additive prognostic value of a cardiopulmonary exercise test score in patients with heart failure and intermediate risk INTERNATIONAL JOURNAL OF CARDIOLOGY Ritt, L. E., Myers, J., Stein, R., Arena, R., Guazzi, M., Chase, P., Bensimhon, D., Ashley, E., Cahalin, L. P., Forman, D. E. 2015; 178: 262–64

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