Frequency of Use of Clinical Trials Registries in Systematic Reviews and Meta-Analyses in Primary Care Journals

Objective: To evaluate the use of clinical trials registries in published primary care systematic reviews and meta-analyses. Background: Systematic reviews and meta-analyses in primary care medicine that do not report searching for unpublished data may be prone to publication bias. This source of bias occurs when systematic review evidence is based solely on a published body of literature and does not account for studies where results failed to...