Table 3.

Risk of bias assessment.

Study	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting
Nenezic2019 [20,28]	Unclear	Low	Low	Unclear	Low	Low
Chetter2017 [19]	Low	Unclear	Low	Unclear	Low	Low
Saha2012 [31]	Unclear	Unclear	Low	Unclear	Low	Low
Saha2011 [30]	Unclear	Unclear	Low	Unclear	Low	Low
Chalmers2010 [29]	Low	Unclear	Low	Unclear	Low	Low