Table 1.

Quality analysis of included trials

Ref.	Randomization method	Allocation concealment	Blinding	Withdraws	Jadad score
Arslani et al[1]	Not mentioned	Adequate	No	Described	4
Basdanis et al[18]	Not mentioned	Adequate	No	Not mentioned	3
Chen et al[19]	Not mentioned	Adequate	No	Not mentioned	3
Kraemer et al[20]	Computer-generated	Adequate	No	Described	5
Sakr et al[21]	Computer-generated	Adequate	Single-blind	Described	5