Table 2.

Quality assessment of included studies.

Study	Design	Items of NIH quality assessment toola														Summary quality
		1	2	3	4	5	6	7	8	9	10	11	12	13	14
Yalcin Bahat et al., 2020 [27]	Case-control	yes	yes	no	no	yes	no	no	no	yes	yes	no	no			Fair
Sinaci et al., 2021 [21]	Case-control	yes	yes	no	yes	yes	yes	yes	yes	no	yes	no	no			Good
Tekin et al., 2021 [20]	Prospective case–control	yes	yes	yes	no	yes	yes	no	yes	yes	yes	no	no			Good
Seven et al., 2021 [30]	Cross-sectional	yes	yes	yes	no	yes	no	no	yes	yes	no	yes	no	no	no	Good
Moreno-Fernandez et al., 2022 [28]	Case-control	yes	yes	yes	yes	yes	yes	no	yes	no	yes	no	no			Good
Schmitt et al., 2022 [29]	Retrospective cohort	yes	yes	yes	yes	no	yes	no	yes	yes	no	yes	no	yes	no	Good
Ferrer-Sánchez et al., 2022 [22]	Case-control	yes	yes	yes	yes	yes	yes	yes	yes	no	yes	no	yes			Good

^aNIH quality assessment tool has 12 questions for Case-Control studies and 14 questions for observational Cohort and Cross-sectional studies.