Table 1.

Risk-of-bias assessment

Study	Selection bias: random-sequence generation	Selection bias: allocation concealment	Performance and detection bias: blinding	Attrition bias: incomplete data	Reporting bias: selective reporting
Abbott et al22	Low	Low	High	Low	Low
Archer et al24	Low	Low	Low	Low	Low
Doering et al25	Low	Unclear	Low	High	Low
Monticone et al23	Low	Low	Low	Low	Low
Rolving et al27	Low	Low	High	Low	Low
Rolving et al26	Low	Low	High	Low	Low

Note: Used Cochrane risk-of-bias assessment tool.