A number of uncontrolled (e.g .4−8) or controlled but non-randomised clinical trials (e.g .9,10,11] suggest that the regular medication with ginkgo biloba is effective in the treatment of tinnitus. As such trials are open to bias and tend to over-estimate the effect size, 12this systematic review was aimed at summarising all randomised controlled trials on this subject.
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Ernst et al. (1999) studied this question.
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