title: The length of consent documents in oncological trials is doubled in twenty years.
mesh_terms: D002986:Clinical Trials as Topic / Q000592:standards*; D032962:Consent Forms / Q000941:ethics*; D004992:Ethics, Medical; D017408:Guidelines as Topic; D006801:Humans; D007258:Informed Consent / Q000941:ethics* / Q000592:standards*; D009369:Neoplasms / Q000628:therapy*; D009664:Norway; D012189:Retrospective Studies