Table 2.

MINORS scores assessing the risk of bias in non-randomized studies

	Clearly stated aim	Inclusion of consecutive patients	Prospective data collection	Endpoints appropriate to study aim	Unbiased assessment of study endpoint	Follow-up appropriate to study aim	< 5% Lost to follow up	Prospective calculation of study size	Adequate control group	Contemporary groups	Baseline equivalence of groups	Adequate statistical analyses	TOTAL MINORS SCORE
Jaffer et al. [29]	2	2	2	2	0	2	0	0	NA	NA	NA	NA	10/16
Kim et al. [27]	2	2	0	2	0	2	0	0	2	2	1	2	15/24
Lin et al. [21]	2	2	0	2	0	2	0	0	NA	NA	NA	NA	8/16
Liao et al. [22]	2	2	1	2	0	2	0	0	2	1	2	2	16/24
Abdelrahman et al. [31]	2	2	1	2	0	2	0	0	NA	NA	NA	NA	9/16
Kim et al. [23]	2	2	0	2	0	2	0	0	NA	NA	NA	NA	8/16
Mán et al. [24]	2	2	0	2	0	2	0	0	2	2	2	2	16/24
Brown et al. [32]	2	2	1	2	0	2	0	0	NA	NA	NA	NA	9/16
Kim et al. [30]	2	2	2	2	0	2	0	1	2	2	1	2	18/24
Lee et al. [25]	2	2	0	2	0	2	0	0	2	2	1	2	15/24
Ussia et al. [26]	2	2	0	2	0	2	0	0	2	2	2	2	16/24
Angeramo et al. [28]	2	2	1	2	0	2	0	0	NA	NA	NA	NA	9/16
Kubat et al. [20]	2	2	2	2	0	2	0	0	2	2	1	2	17/24