Study Year of
publication 		Random
sequence
generation 		Allocation
concealment 		Defined
inclusion/
exclusion 		Blinding of
participants
and/or
personnel 		Blinding of
outcome
assessment 		Incomplete
outcome
data 		Selective
reporting
Thakkar et al. [30] 2016 N/A N/A + + + + +
Baniasadi and Evrard [31] 2017 N/A N/A - + + + +
Das et al. [32] 2016 + N/A + + + + +
Hauser et al. [33] 2013 + N/A + + + + +
Wood and Mealey [34] 2012 N/A N/A + + + + +
Gholami et al. [35] 2012 + N/A + + + + +
Barone et al. [36] 2013 N/A N/A + + + + +
Kotsakis et al. [37] 2014 + N/A + + + + +
Mahesh et al. [38] 2015 + N/A + + + + +
Barone et al. [39] 2013 + N/A + + + + +
Canullo et al. [40] 2015 N/A N/A + + + + +
Mayer et al. [41] 2016 + N/A + + + + +
Joshi et al. [42] 2016 + N/A + + + + +
Pang et al. [43] 2014 N/A N/A + + + + +
Natto et al [44] 2017 + + + + + + +
Nam et al. [45] 2011 N/A N/A + + + + +

+ = low risk; N/A = unclear risk; - = high risk.