title: Absence of evidence is not evidence of absence.
authors.forename: D G
authors.initials: DG
authors.lastname: Altman
authors.forename: J M
authors.initials: JM
authors.lastname: Bland
mesh_terms: D000818:Animals; D016022:Case-Control Studies; D002986:Clinical Trials as Topic; D019317:Evidence-Based Medicine; D006801:Humans; D015201:Meta-Analysis as Topic; D012106:Research; D018401:Sample Size