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Table 2

Risk of bias assessment summary of the seleceted studies

  Random sequence generation Allocation concealment Blinding of participants and personnel Blinding of outcomes assessment Incomplete outcome data Selective reporting Other sources of bias
[17] × × ? ?
[18] × × ? ?
[19] × × ? × ?
[11] × × ? ?
[20] × × ? ?
[21] × × ? ×
[22] × × ?
[23] × × ? × × ×
[24] × × ?
[25] × × ? ?
[26] × × ? ?
[27] × × ? × × ×
[28] × × ?
[29] × × ? × × ×
[30] × × ? ×
[31] ×
[32] × × ? ?
[33] × × ? ?
[34] ?
[35] × × ? ?
[36] × × ? × ?

√ = low risk; ? = unclear risk; × = high risk.

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