_:b57316269 <http://www.w3.org/ns/oa#exact> "efficacy" . _:b57316268 <http://www.w3.org/ns/oa#hasSelector> _:b57316269 . _:b57316269 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b57316268 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/752402c32895a7c8c86530c8d20e60a5e7780400/2> .