Most overviews of Cochrane reviews neglected potential biases from dual authorship

Ref ID	613
First Author	R. B. Buchter
Journal	JOURNAL OF CLINICAL EPIDEMIOLOGY
Year Of Publishing	2016
URL	https://www.jclinepi.com/article/S0895-4356(16)30095-6/fulltext
Keywords	• General medical • Allegiance • Influence • Cochrane • Protocols • Author • Transparency
Problem(s)	• Non-financial conflicts of interest of review authors
Number of systematic reviews included	20
Summary of Findings	In 18 of 20 (90%) of included overviews, at least one of the included reviews was affected by dual (co-) authorship. In 11 of 18 affected overviews (61%), dual (co-) authorship was mentioned under declarations of interest. In 5 of 18 overviews (28%), it was considered in the limitations section.
Did the article find that the problem(s) led to qualitative changes in interpretation of the results?	N/A
Are the methods of the article described in enough detail to replicate the study?	Yes