Study
Random Sequence Generation
Allocation concealment
Blinding of participants and personnel
Blinding of outcome assessment
Incomplete outcome data
Selective outcome reporting
Other sources of bias
Overall Risk of Bias
Durkalec-Michalski et al.(2017) L L L L L L L L
Asadi et al. (2017) L H L L L L L L
Durkalec-Michalski et al. (2015) H L L L L L L L
Portal et al. (2011) L L L L L L U L
Hoffman et al. (2004) U U L L L L L L
Crowe et al. (2003) U H H H H L L H
Slater et al. (2001) U L U U U L L M