Table 3.

Assessment of the methodological quality of included studies [11].

Author	Randomization	Double blinding	Allocation concealment	Withdrawals/dropouts	Scores
Kumarathurai et al. [18]	Yes	Yes	Unclear	Yes	6
Paiman et al. [19]	Yes	Yes	Yes	Yes	7
Wagner et al. [20]	Yes	Yes	Unclear	Yes	6
Bizino et al. [21]	Yes	Yes	Yes	Yes	7
Jorgensen et al. [22]	Yes (method unclear)	Yes	Unclear	Yes	5
Zhang et al. [23]	Yes	Yes	Unclear	Yes	6
Jorsal et al. [24]	Yes	Yes	Yes	Yes	7
Chen et al. [25]	Yes	Yes	Unclear	Yes	6
Kumarathurai et al. [26]	Yes	Yes	Unclear	Yes	6
Chen et al. [27]	Yes	Yes	Unclear	Yes	6