Quality Assessment
The methodological quality of the included studies was assessed by two independent reviewers (ZY and GXH), and inconsistencies were solved by consensus or involving a third researcher (LY). We followed the criteria of the Cochrane Collaboration risk-of-bias tool as guides. The quality items assessed were selection bias (random sequence generation and allocation concealment), performance bias (blinding of participants, personnel, and outcome assessors), attrition bias, measurement bias, reporting bias, and other bias.