The review addressed a clear question and the inclusion criteria appear appropriate. The search was limited to one electronic database and to English language articles, although the authors did not find evidence of publication bias among the studies included in the review. However, given the subject area, it is highly likely that additional studies have been published in languages other than English, thus suggesting that some relevant studies might have been overlooked. Discrepancies in the reporting of the review process meant that it was unclear whether methods were used to minimise bias in the selection of studies for inclusion. In addition, details of the data extraction processes were not reported, which meant the potential for reviewer error or bias could not be assessed. No formal quality assessment was performed, thus it was not possible to assess the validity of the included studies.
Information from the National Library of Medicine
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Ages Eligible for Study: 18 Years to 70 Years (Adult, Senior) Sexes Eligible for Study: All Accepts Healthy Volunteers: No Criteria Inclusion Criteria: