_:b56811612	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/b6d5e7fae9cb10b697ee57a5099e4cec83141463/2> .
_:b56811613	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b56811612	<http://www.w3.org/ns/oa#hasSelector>	_:b56811613 .
_:b56811613	<http://www.w3.org/ns/oa#exact>	"left ventricular ejection fraction" .