Table 2. Quality of the five included trials.

Trial	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias	Rank
Paccagnella et al. 201018	Yes	Yes	Unclear	Yes	Yes	Yes	Yes	B
Chen et al. 201119	Yes	Unclear	Unclear	Unclear	Yes	Yes	Yes	B
Haddad et. al. 201320	Yes	No	No	No	Yes	Yes	No	C
Cohen et al. 201421	Yes	Unclear	No	No	Yes	Yes	Yes	C
Hitt et al. 201422	Yes	Unclear	Unclear	Unclear	Yes	Yes	Yes	B