Table 2. Assessment of Methodological Quality of Included Studies.

Study	random allocation	Hidden distribution	Blind method	Incomplete Outcome Data	Selective reporting of results	Other bias	quality grade
Wu HB[22]	mentioned random	Low	Single-blind	Low	Low	Low	A
Xu CZ[23]	mentioned random	Low	Single-blind	Low	No clear	Low	B
Zou Y[24]	No clear	Low	Single-blind	Low	Low	Low	B
Chen QY[25]	No clear	Low	No clear	Low	Low	Low	B
Jiao YG[26]	No clear	Low	Single-blind	Low	No clear	Low	B
Li H[27]	mentioned random	Low	Single-blind	Low	Low	Low	A
Gui W[28]	mentioned random	Low	Single-blind	Low	Low	Low	A
Yang Y[29]	random number table	Low	Single-blind	Low	Low	Low	A
Shi YB[30]	mentioned random	Low	Single-blind	Low	Low	Low	A
Liao BH[31]	mentioned random	Low	No clear	Low	Low	Low	B
Luo J[32]	mentioned random	Low	Single-blind	Low	Low	Low	A