{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC7153408#body_text"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Valvular heart disease",
          "Stereochemists",
          "Inflammations",
          "Rheumatology",
          "Medical mnemonics"] } } }
