Table 3: Risk of bias amongst the included studies.

Serial numberAuthorRandomizationAllocation concealmentBlindingIncomplete data outcome reporting Outcome

1 Mihrshahi et al. [29]RandomizedYesDouble blindNot statedLow
2Marks et al. [30]RandomizedYesDouble blindNot statedLow
3Birch et al. [31]RandomizedNot clearDouble blindNot doneModerate
4D’Vaz et al. [32]RandomizedYesDouble blindYesNo
5Ng et al. [33]RandomizedYesDouble blindNot statedLow