“…Of these, 60 full texts were retrieved and further screened, and 35 studies were finally included ( Figure 1 ). Of these 35 studies, 7 were before–after studies [24] , [25] , [26] , [27] , [28] , [29] , [30] and 28 were controlled trials [31] , [32] , [33] , [34] , [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] , [43] , [44] , [45] , [46] , [47] , [48] , [49] , [50] , [51] , [52] , [53] , [54] , [55] , [56] , [57] , [58] . Of the trials included in this review, 19 were adequately randomized [32] , [33] , [37] , [38] , [39] , [40] , [41] , [44] , [45] , [46] , [47] , [48] , [50] , [53] , [54] , [55] , [56] , [57] , [58] , and all controlled trials had appropriate control groups.…”