Quality and risk-of-bias assessments
Two researchers independently evaluated and cross-checked the literature (FF. Liang & YZ. Zhou), and the Cochrane Collaboration Risk of bias (ROB) assessment tool was used for RCT. It consists of six aspects with seven elements: selection (random sequence production and allocation concealment), implementation (blinding of participants and personnel), measurement (blinding of outcome assessment), follow-up (incomplete outcome data), report (selective outcome reporting) and other bias, every item was classified as "low risk of bias", "high risk of bias" and "unclear" [