RT Journal Article SR Electronic T1 Automatic extraction of quantitative data from ClinicalTrials.gov to conduct meta-analyses JF BMJ Evidence-Based Medicine JO BMJ EBM FD BMJ Publishing Group Ltd SP 113 OP 114 DO 10.1136/bmjebm-2019-111206 VO 25 IS 3 A1 Thomas R Fanshawe A1 Rafael Perera YR 2020 UL http://ebm.bmj.com/content/25/3/113.abstract AB