RESULTS

Our electronic search yielded 4,056 studies, with an additional 9 studies identified through manual searches. After removal of duplicates, we screened 3,257 titles and abstracts. We assessed 209 full-text manuscripts for eligibility and included 126 studies in this review (Figure 1) (see the Supplementary Appendix C for details of studies features and Appendix D for the list of included studies).