A 6-month follow-up of intermittent levosimendan administration effect on systolic function, specific activity questionnaire, and arrhythmia in advanced heart failure - Mavrogeni, Sophie; Giamouzis, Gregory; Papadopoulou, Evangelia; Thomopoulou, Sophia; Dritsas, Athanasios; Athanasopoulos, George; Adreanides, Elias; Vassiliadis, Ioannis; Spargias, Konstantinos; Panagiotakos, Dimosthenis; others (Journal of cardiac failure, 2007)