@article {esc1993guidelines,
	title = {Guidelines for cardiac exercise testing},
	journal = {European Heart Journal},
	volume = {14},
	number = {7},
	year = {1993},
	pages = {969{\textendash}988},
	publisher = {Oxford University Press},
	author = {ESC Working Group on Exercise Physiology, Physiopathology and Electrocardiography}
}
