“…The main characteristics of the 45 included studies are shown in Table 1. In accordance with the recommended NOS and AHRQ criteria, only studies of acceptable quality were included in the present meta-analysis; eight studies received 9 stars [51,53,[56][57][58]62,63,66], ten studies received 8 stars [43,[48][49][50]52,54,55,[59][60][61], ve studies received 7 stars [42,[44][45][46][47] and one study received 6 stars [41]. When using the quality assessment criteria from the AHRQ, three studies received a score of 11 [24,29,65], ten received a score of 10 [22,25,28,29,31,33,34,36,39,40], three received a score of 9 [23,32,35], one received a score of 8 [27], one received a score of 7 [37] and two received a score of 5 [26,38], the quality assessment are shown in Appendix S2.…”