Table 3. Search methodology.

Author (year)	Language Restriction	Publication status Restriction	Pubmed	Embase	SCOPUS	Medline	Cochrane Library	Web of Science	CNKI	WANFANG	CINAHL	VIP Database	Google Scholar
Liu B (2020)	Yes	NA		*		*	*	*
Kong X (2020)	No	NA	*	*			*		*	*
Li N (2020)	No	Yes	*	*			*
Luo X (2012)	Yes	Yes		*		*	*
Kumar P (2019	Yes	Yes	*	*	*
Azegami S (2011)	No	No		*		*	*				*
Li T (2013)	Yes	Yes	*	*			*		*			*
Ning G (2014)	Yes	Yes	*	*		*	*						*
Lin FF (2019)	No	NA	*	*			*						*
Veldman HD (2017)	No	NA	*	*			*	*
Nantha Kumar N (2020)	No	Yes	*	*		*	*	*			*
Li L (2021)	No	Yes	*	*		*	*