@article {athanasopoulos2010relationships,
	title = {Relationships between changes in time of quality of life and changes in time of the results of cardiopulmonary exercise test and echocar-diography at a follow-up of patients with heart failure},
	journal = {Archives of Cardiovascular Diseases Supplements},
	volume = {2},
	year = {2010},
	pages = {22{\textendash}38},
	author = {Athanasopoulos, Leonidas and Dritsas, Athanasios and Tsakalou, Marianthi and Cokkinos, Dennis}
}
