Table 2: A summary of GRADE’s approach to rate the overall quality of evidence.

Article	Risk of Bias	Inconsistency	Indirectness	Imprecision	Publication Bias	Overall Quality of Evidence
Mcgorray et al., 2011 [21]	Not serious	Not serious	Not serious	Not serious	None	High
Arantes et al., 2009 [22]	Not serious	Not serious	Not serious	Not serious	None	High
Hussain et al., 2011 [23]	Very serious	Not serious	Not serious	Not serious	None	Low
Yamasaki et al., 1984 [24]	Very serious	Not serious	Not serious	Not serious	None	Low
Patil et al., 2005 [25]	Very serious	Not serious	Not serious	Not serious	None	Low
Sari et al., 2004 [26]	Very serious	Not serious	Not serious	Not serious	None	Low
Shetty et al., 2013 [27]	Very serious	Not serious	Not serious	Not serious	None	Low
Karadeniz et al., 2011 [28]	Very serious	Not serious	Not serious	Not serious	None	Low