Predictive biomarkers for functional status and quality of life in heart failure patients with severely impaired left ventricular systolic function.: P870 - Zivlas, CChristos; Stefanidis, A; Triposkiadis, F.; Kostopoulos, K.; Margos, P; Kotsakis, A.; Skoularigis, J; Giamouzis, G; Kranidis, A; Cokkinos, D (European Journal of Heart Failure, 2014)