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Study Selection Flow Diagram. The results from the 8 search strings described (n=1,093) were screened for duplicates. These results from each string were combined, and then screened by their abstracts (n=994). Full texts for the results that were deemed to be relevant from the abstract were sought (n=375). Full texts were assessed (n=172). Review papers (n=81), and posters/abstracts/letters (n=19) were excluded. 72 full-text records were included in this review.
