Table 3. Quality assessment of included articles.

	Selection	Comparability	Outcome	Total
Reference	(0–4)	(0–2)	(0–3)	(0–9)
Chiu et al [30]	****	*	**	7
Kim et al [31]	****	*	**	7
Etoh et al [32]	***	*	***	7
Choi et al [33]	****	**	**	8
Kim et al [34]	****	*	**	7
Najmeh et al [35]	****	*	*	6