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Systematic review of the data bases. From the initial data base search, 165 articles were identified for full-text review. Manual review of the citations of those 165 articles identified 807 citations that were further screened by title and abstract. This resulted in 69 articles for full-text review from the manual citation search. A total of 234 articles underwent full-text review, from which 128 articles met the predetermined inclusion and exclusion criteria.
