Case series – Newcastle-Ottawa Scale.

Author		Dhar et al. (2020) (29)	Flaifel et al. (2021) (33)	Fraietta et al. (2022) (34)	Li et al. (2020) (41)	Mumm et al. (2020) (52)	Nie et al. (2021) (53)	Ning et al. (2020) (54)	Pavone et al. (2020) (57)	Song et al. (2020) (63)	Yang et al. (2020) (66)
Selection
	1	1	1	1	1	1	1	1	1	1	1
	2	0	0	0	0	0	0	1	1	0	1
	3	0	0	0	0	0	0	0	0	0	0
	4	0	0	0	0	0	0	0	0	0	0
Confounder
	1	0	0	0	0	0	0	0	0	0	0
Exposure
	1	0	1	1	1	1	1	0	1	1	1
	2	1	1	1	1	1	1	1	1	1	1
	3	0	0	0	0	0	0	0	0	0	0
Total		2	3	3	3	3	3	3	4	3	3