Study Year of
publication 		Study design Checklist
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11
Eguchi et al. [16] 2017 Retrospective
cohort study 		+ + + + + + + + + + +
Park et al. [17] 2017 Prospective
cohort study 		+ + + + ? + + + + ? +
Ristow et al. [18] 2018 Retrospective
cohort study 		NA NA + + + ? + + + + +
El-Rabbany et al. [19] 2019 Retrospective
cohort study 		+ + + - - + + + + + +
Guo and Guo [20] 2020 Retrospective
cohort study 		+ + + - ? + + + + + +
Szentpeteri et al. [21] 2020 Retrospective
cohort study 		- + + + + + + + + + +
Şahin et al. [22] 2021 Retrospective
cohort study 		NA NA + + ? + + + + + +

? = unclear; + = yes; - = no; NA = not applicable.