“…Based on the QUIPS tool, no studies were excluded. In short, five (27,29,31,32,34) out of 28 studies were rated as having a high risk of bias, eight (22,24,26,39,(45)(46)(47)(48) as moderate, and 15 (23, 25, 28, 30, 33, 35-38, 40-44, 49) as low. Overall, the risk of six domains was judged to vary from low to high-risk bias, respectively, in "study participation" (low risk: 60.71%, moderate risk: 32.13%, and high risk: 7.14%), "study attrition" (low risk: 39.29%, moderate risk: 53.57%, and high risk: 7.14%), "prognosis factor measurement" (low risk: 71.43%, moderate risk: 25.00%, and high risk: 3.57%), "outcome measurement" (low risk: 92.86% and moderate risk: 7.14%), "study confounding" (low risk: 71.43%, moderate risk: 25.00%, and high risk: 3.57%), and "statistical analysis and reporting" (low risk: 46.43% and moderate risk: 53.57%) (Figure 2).…”