| http://www.w3.org/ns/prov#value | - As noted in the Cochrane review, further research would be useful, such as head-to-head comparisons of the various HA products, longer term trials (up to 1 year), and trials examining repeated courses of treatment with HA. The Arrich et al. review also found improvement in pain with hyaluronic acid injections but emphasized that the benefits were borderline in clinical significance.
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