Table 2.

Quality assessment of included studies

Study	Selection	Comparability	Exposure/outcome	Total
Feagin et al. [18]	3	2	3	8
Fisher et al. [19]	2	2	3	7
Wasilewski et al. [20]	2	2	3	7
Dandy et al. [21]	2	2	3	7
Wachtl et al. [22]	2	2	3	7
Cosgarea et al. [23]	3	2	3	8
Kao et al. [24]	2	2	3	7
Orfaly et al. [25]	3	2	2	7
Meighan et al. [26]	3	2	3	8
Millett et al. [27]	2	2	3	7
Nicholas et al. [28]	2	2	3	7
Prodromos et al. [29]	3	2	3	8
Robertson et al. [8]	3	2	3	8
Nwachukwu et al. [6]	3	2	3	8
Demirağ et al. [30]	3	2	3	8
Kiekara et al. [31]	3	2	3	8
Hettrich et al. [32]	3	2	3	8
Csintalan et al. [33]	3	2	3	8
Cruz et al. [34]	3	2	3	8
Werner et al. [35]	3	2	3	8
Cancienne et al. [36]	3	2	3	8
Sanders et al. [9]	3	2	2	7
Ding et al. [37]	3	2	3	8
Meister et al. [38]	2	2	3	7
Bordes et al. [39]	3	2	2	7
Runner et al. [40]	3	2	3	8
Su et al. [41]	3	2	3	8
Huleatt et al. [12]	3	2	3	8
Osti et al. [42]	3	2	3	8
Westermann et al. [43]	3	2	3	8
Patel et al. [44]	3	2	3	8
Cruz et al. [45]	3	2	2	7
Offerhaus et al. [46]	3	2	3	8
Panisset et al. [47]	2	2	3	7
Romain et al., 2019	3	2	3	8
Rushdi et al. [15]	3	2	3	8
Grassi et al. [48]	3	2	3	8