caption: Figure 1 is a flow chart that outlines the citation retrieval and study selection process. It begins with the total number of citations retrieved from the literature searches and ends with the number of studies that satisfied the inclusion criteria for this report. This figure is further described in the report section entitled, ``Results of Literature Searches''. We identified 4,218 citations from all databases combined. 1,240 duplicates were excluded leaving 2,978 citations to review. Of those, 2,786 references were excluded for not meeting selection criteria on screening of titles and abstracts, leaving 192 articles that underwent full-text screening: 88 randomized controlled trials (RCTs), 42 observational studies and 62 surgical case series. Of those, 75 were excluded for not meeting selection criteria, leaving 115 unique studies from 117 articles that were included in this review: 50 RCTs, 14 observational studies and 53 surgical case series.
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