Supplementary Table II (online only).

Risk of bias assessment of cohort and case-control studies using Newcastle-Ottawa scale

Investigator	Study design	Score by reviewers 1 and 2a
		Selection	Comparability	Exposure or outcome	Risk of bias
Charoenngam et al, 2021	Retrospective cohort, single-center	3	2	2	Low
Cho et al, 2021	Retrospective cohort, single-center	4	1	2	Low
Cohen et al, 2021	Retrospective cohort, single-center	4	1	2	Low
Esenwa et al, 2021	Retrospective cohort, multicenter	4	1	2	Low
Koleilat et al, 2021	Retrospective case-control, single-center	3	1	2	High
Bilaloglu et al, 2020	Retrospective cohort, multicenter	1	1	2	High
Creel-Bulos et al, 2020	Retrospective cohort, single-center	3	2	2	Low
Maatman et al, 2020	Retrospective cohort, multicenter	4	1	2	Low
Papageorgiou et al, 2020	Retrospective cohort, multicenter	4	2	2	Low
Poyiadji et al, 2020	Retrospective cohort, single-center	3	1	2	High
Xu et al, 2020	Retrospective cohort, multicenter	2	1	2	High

^aNumerical values represent stars awarded for each section evaluated.