Table 2.

Evaluation of bias of RCTs included in the meta-analysis.

First author	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Adequate assessment of incomplete outcome	Selective reporting avoided	No other bias
Shioji	Yes	Yes	No	No	Yes	Yes	Yes
Tominaga	Yes	Yes	No	No	Yes	Yes	Yes
Mori	Yes	Yes	No	No	Yes	Yes	Yes
Dokoshi	Yes	Yes	No	No	Yes	Yes	Yes
Zhang	Yes	Yes	No	No	Yes	Yes	Yes
Osada	No	Yes	No	No	Yes	Yes	Yes
Matsumoto	Yes	Yes	No	No	Yes	Yes	Yes

Yes: Low risk of bias

No: High risk of bias

Unclear: Unclear risk of bias