_:b56680020 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/e616833fba81dc501224851748bdb4ee3365b77f/0> . _:b56680021 <http://www.w3.org/ns/oa#exact> "response rate" . _:b56680021 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b56680020 <http://www.w3.org/ns/oa#hasSelector> _:b56680021 .