Table 2.

Quality assessment of experimental studies.

References	Was true randomization used for assignment of participants to treatment groups?	Was allocation to treatment groups concealed?	Were treatment groups similar at the baseline?	Were participants blind to treatment assignment?	Were those delivering treatment blind to treatment assignment?	Were outcomes assessors blind to treatment assignment?	Were treatment groups treated identically other than the intervention of interest?	Was follow up complete and if not, were differences between groups in terms of their follow up adequately described and analyzed?	Were participants analyzed in the groups to which they were randomized?	Were outcomes measured in the same way for treatment groups?	Were outcomes measured in a reliable way?	Was appropriate statistical analysis used?	Was the trial design appropriate, and any deviations from the standard RCT design accounted for in the conduct and analysis of the trial?
Meng et al. (18)	No	No	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	No
Häberle et al. (19)	No	No	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	No
Leng et al. (20)	No	Yes	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	No
Nesrin et al. (21)	No	No	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	No
Xu et al. (22)	No	No	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	No
Giacomo et al. (23)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Lei et al. (24)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Shu et al. (25)	Yes	Yes	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Gina Marcela Torres et al. (26)	Yes	Yes	Yes	Na	Na	Na	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Dynasty (27)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

NA, Not applicable.