Table 2.

Quality assessment of the included cohort, case-control, and cross-sectional studies

Author (ref.)	selection				comparability	outcome			Total score	Total Quality
	1	2	3	4	1	1	2	3
Buchanan et al. [9]	*	*	*		*	*	*		6	Satisfactory
Cerbasi et al. [17]	*	*	*	*	*	*	*	*	8	Good
Costantino et al. [10]	*	*	*		*	*	*	*	8	Good
Dwivedi et al. [11]	*	*	*		*	*	*	*	7	Good
Gudipati et al. [12]	*	*	*		*	*	*	*	7	Good
Kim et al. [4]	*	*	*		*	*	*	*	7	Good
Licht et al. [13]	*	*	*		**	*	*	*	8	Good
Malinoski et al. [18]	*	*	*		**	*	*		8	Good
McDuffie et al. [14]	*	*	*		*	*	*	*	7	Good
Minshall et al. [15]	*	*	*		*	*		*	6	Satisfactory
Tofigh et al. [20]	*	*	*		*	*	*		6	Satisfactory
Velmahos et al. [16]	*	*	*		*	*	*		6	Satisfactory
Zhou et al. [19]	*	*	*		*	*	*	*	7	Good