Study Year of publication Adequate sequence generation? Allocation concealment? Blinding?
All outcomes 		Incomplete outcome data addressd? Risk of
bias
Lekovic et al. [12] 1998 Low Low Low Low Low
Iasella et al. [21] 2003 High Low Unclear Unclear High
Meloni et al. [45] 2015 Low Low Low Unclear Low
Perelman-Karmon et al. [46] 2012 Low Low Unclear Unclear Low
Nam et al. [47] 2010 Unclear Unclear Unclear High High
Barone et al. [48] 2008 High Low Low Unclear High

Low = low risk of bias; Unclear = unclear risk of bias; High = high risk of bias.