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Platelet-rich plasma injection is not more effective than hyaluronic acid to treat knee osteoarthritis when using a random-effects model

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  • Contributors ZW and YL conducted the study, analysed the data, and wrote and submitted the manuscript. ML planned the study, analysed the data and corrected the manuscript.

  • Competing interests None declared.

  • Provenance and peer review Commissioned; externally peer reviewed.