“…Figure 1 shows the risk of bias of the included studies. All 73 studies mentioned randomization in the trials; however, 16 studies used the visiting sequence, which is considered to have high risk of bias for random sequence generation; [28,43,53,54,58,59,61,62,65,70,73,75,82,83,87,88] 36 studies provided information on allocation concealment, [14,15,[22][23][24]28,29,31,[35][36][37][38][39][40][42][43][44][45][46]52,54,57,63,68,[74][75][76]79,80,83,[85][86][87]…”