Table 1.

Methodological quality evaluation of included studies

Studies	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias
Voysey 2021[19]	low risk	low risk	high risk	low risk	high risk	low risk	high risk
Polack 2020[20]	low risk	low risk	high risk	low risk	low risk	low risk	high risk
Xia 2020[21]	low risk	low risk	low risk	low risk	low risk	low risk	low risk
Pu 2020[22]	low risk	low risk	low risk	low risk	high risk	low risk	high risk
Xia 2021[27]	low risk	low risk	low risk	low risk	high risk	low risk	low risk
Che 2020[28]	low risk	low risk	low risk	low risk	low risk	low risk	low risk
Ella 2020[29]	low risk	low risk	low risk	low risk	high risk	low risk	high risk
Keech 2020[30]	low risk	low risk	low risk	unclear	high risk	low risk	high risk
Mulligan 2020[31]	low risk	low risk	low risk	low risk	high risk	low risk	high risk
Richmond 2020[32]	low risk	low risk	low risk	low risk	low risk	low risk	high risk
Walsh 2020[33]	low risk	low risk	high risk	low risk	high risk	low risk	low risk
Zhang 2021[34]	low risk	low risk	low risk	low risk	high risk	high risk	high risk
Zhu 2020[35]	low risk	low risk	low risk	low risk	low risk	high risk	high risk