Table 3.

Overall risk of bias

S. no.	Domain	Abdlemotleb et al. (2021)	Aldayari et al. (2019)	Masuda et al. (2011)
1	A clearly stated aim	2	2	0
2	Inclusion of consecutive patients	2	2	0
3	Prospective collection of data	2	2	2
4	Endpoints appropriate to the aim of the study	2	2	0
5	Unbiased assessment of the study endpoint	0	0	0
6	Follow-up period appropriate to the aim of the study	2	2	2
7	Loss to follow-up <5%	2	2	2
8	Prospective calculation of the study size	2	2	0
Additional criteria for comparative study
9	An adequate control group	2
10	Contemporary groups	2
11	Baseline equivalence of groups	2
12	Adequate statistical analysis	2
Total score		22/24	14/16	6/16