Table 2. Risk of bias among the studies included in the meta-analysis.

Study, yr	Sequence generation	Allocation concealment	Blinding of participants and researchers	Blinding of outcome assessment	Incomplete outcome data addressed	Free of selective reporting
Corte et al.24	Unclear	Unclear	Low risk	Low risk	Low risk	Low risk
Han et al.15	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk
Jackson et al.31	Unclear	Unclear	Unclear	Unclear	Low risk	Low risk
King et al.14	Unclear	Unclear	Low risk	Low risk	Low risk	Low risk
King et al.27	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk
Kolb et al.25	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk
Raghu et al.28	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk
Raghu et al.29	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk
Tanaka et al.26	Unclear	Unclear	High risk	High risk	Low risk	Low risk
Zisman et al.30	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk