title: Half of drug trials with results on ClinicalTrials.gov are not published in journals.
authors.affiliation: London.
authors.forename: Susan
authors.initials: S
authors.lastname: Mayor
mesh_terms: D002986:Clinical Trials as Topic / Q000706:statistics & numerical data*; D020407:Internet; D011643:Publishing / Q000706:statistics & numerical data*; D014481:United States