_:b57881056	<http://www.w3.org/ns/oa#hasSelector>	_:b57881057 .
_:b57881057	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57881057	<http://www.w3.org/ns/oa#exact>	"Serum ferritin" .
_:b57881056	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/abdfbaa000a674b8344277f052efc65db0ae3769/3> .