{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC7099715#title"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Blood products",
          "Blood",
          "Body fluids",
          "Hematology",
          "Medical treatments",
          "Transfusion medicine"] } } }
