{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC6134106#title"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Genetic genealogy",
          "Free radicals",
          "Demography",
          "Longevity",
          "Theories of ageing",
          "Theories of biological ageing",
          "Senescence",
          "Mutation",
          "Population",
          "Proximate theories of biological ageing"] } } }
