Table 3.

Quality assessment of the included trials

Authors and year of publication	Randomization	Allocation concealment	Blinding	Withdrawal and dropout	Jadad score
Schuhmacher et al[15], 2010	Without details	Without details	Without details	Well reported	4
Boige et al[11], 2011	Without details	Without details	Without details	Well reported	4
Cunningham et al[12], 2006	Well reported	Envelope	Double-blind	Well reported	7
Hartgrink et al[13], 2004	Well reported	Envelope	No	Well reported	5
Zhang et al[17], 2004	Without details	None	No	Well reported	2
Kobayashi et al[14], 2000	Well reported	Envelope	No	Well reported	3
Wang et al[16], 2000	Without details	Without details	No	Well reported	3