Table 2.

Quality of the selected RCTs.

RCT	Randomization	Double blinding	Withdraw	Proper randomization	Proper double blinding	Score
Wu et al. [47]	1	0	1	0	0	2
Nicot et al. [34]	1	0	1	1	0	3
Karsenty et al. [35]	1	0	1	0	0	2
Yi et al. [36]	1	0	1	1	0	3
Sheu et al. [37]	1	0	1	0	0	2
Hojo et al. [38]	1	0	1	1	0	3
Bettega et al. [39]	1	0	1	0	0	2
Wu et al. [40]	1	0	1	0	0	2
Su et al. [41]	1	0	1	1	0	3
Chent et al. [24]	1	0	1	1	0	3
Alali et al. [42]	1	0	1	0	0	2
Lim et al. [43]	1	1	1	1	1	5
Kong et al. [44]	1	0	1	1	0	3
Wang et al. [45]	1	0	1	0	0	2
Li et al. [66]	1	0	1	1	0	3