Dear Editor, The special issue of Cephalalgia on Pearls and Pitfalls in Headache Research is commendable. Its laudable goal of guiding the reader to understand limitations of a given study, however, demands that the editor is aware of the pitfalls awaiting readers of imprecise or biased review, not to mention disservice to the research, particularly because access to letters of clarification as I intend here is uncommon when reading review articles.
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