PMC:7551987 / 2213-2313 JSONTXT

{"project":"2_test","denotations":[{"id":"32971954-25087040-143921925","span":{"begin":80,"end":81},"obj":"25087040"},{"id":"32971954-6755367-143921926","span":{"begin":82,"end":83},"obj":"6755367"},{"id":"32971954-9744106-143921927","span":{"begin":86,"end":87},"obj":"9744106"},{"id":"32971954-26302775-143921928","span":{"begin":90,"end":91},"obj":"26302775"},{"id":"32971954-30777585-143921929","span":{"begin":92,"end":93},"obj":"30777585"}],"text":"transmission has been the object of both theoretical and empirical examination [2,3,4,5,6,7,8]. Free"}