@article {kallistratos2008chronotropic,
	title = {Chronotropic and neurohumoral markers for the evaluation of functional capacity in patients with impaired left ventricular function},
	journal = {Hellenic J Cardiol},
	volume = {49},
	number = {1},
	year = {2008},
	pages = {26{\textendash}32},
	author = {Kallistratos, Manolis S and Dritsas, Athanasios and Laoutaris, Ioannis D and Cokkinos, Dennis V}
}
