Table 2.

Quality assessment of included randomized controlled trials

Trials	Randomization	Allocation concealment	Blinding of participants and personnel	Blinding of assessors	Incomplete outcome data	Selective reporting	Other sources of bias	Risk of bias
Cai[31]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Feng[32]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Guo et al[33]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Lu[34]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Lu et al[35]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Meng[36]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Wen[37]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Dai[38]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Ji[39]	Unclear	Unclear	High	Unclear	Yes	No	Unclear	High
Hou et al[40]	Table of random number	Unclear	High	Unclear	Yes	No	Unclear	Unclear