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In total, 3646 records were identified through systematic literature searches and an additional 453 records via grey literature, manual search of the reference lists of the included research articles and reviews, and articles received through professional contacts. This added up to a total of 4099 records which after duplicate removal yielded 3185 unique studies for screening. Out of these, 48 studies (described in 51 articles) were included in this review (Fig. 1).
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