Author	Sequences generation	Allocation concealment	Blinding of participants and researchers	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias
Zabet, et al.	low	low	low	low	low	low	low
Tanaka H	unclear	high	high	high	low	low	low
et al.	unclear	high	high	high	low	low	low
Ferrón-Celma et al.	unclear	low	high	high	low	low	low
Fowler et al.	low	low	low	low	low	low	low