@article {athanasopoulos2010comparative,
	title = {Comparative value of NYHA functional class and quality-of-life questionnaire scores in assessing heart failure},
	journal = {Journal of cardiopulmonary rehabilitation and prevention},
	volume = {30},
	number = {2},
	year = {2010},
	pages = {101{\textendash}105},
	publisher = {LWW},
	author = {Athanasopoulos, Leonidas V and Dritsas, Athanasios and Doll, Helen A and Cokkinos, Dennis V}
}
