Table 3. Risk of bias in the included trials.

	Sequence generation	Allocation concealment	Patients blinded	Health care providers blinded	Data collectors blinded	Outcome assessors blinded	Incomplete outcome data	Selective reporting	Other bias	Summary
Birbicer 2007 [18]	Unclear	Unclear	Low	Low	Unclear	Unclear	Unclear	Low	Low	Unclear
Elshal 2009 [19]	Unclear	Low	Unclear	Low	Low	Low	Low	Unclear	Low	Unclear
Kim 2014 [20]	Low	Unclear	Low	Low	Low	Low	Low	Low	Low	Unclear
Yousef 2014 [21]	Unclear	Unclear	Low	Unclear	Low	Low	Unclear	Low	Low	Unclear
Sridhar 2017 [16]	Unclear	Unclear	Low	Unclear	Unclear	Low	Unclear	Low	Low	Unclear
Askar 2017 [17]	Low	Unclear	Low	Low	Low	Low	Unclear	Low	Low	Unclear