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We talk and worry a lot about financial conflicts of interest. But what about when systematic reviewers are authors of the studies of the review? I looked for evidence of whether it has an impact, and discussed it at Absolutely Maybe: Should We Trust Meta-Analyses With Meta-Conflicts of Interest?

Also this month, a 2-part look at milestones in research on peer review:  Off to a Patchy Start (1945-1989) and Trials at Last & Even More Questions (1990-2018).