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an organized and meta-analysis was conducted to examine evidence of this ramifications of botulinum toxin A on chronic tension-type headache. Cochrane, Embase, Ovid, ProQuest, PubMed, Scopus, Web-of-Science databases, and ClinicallTrials.gov registry were methodically looked for researches examining the results of botulinum toxin A on tension-type problems. The records were screened by two separate reviewers using pre-determined qualifications requirements. DerSimonian Liard random-effect