Table 3.

Quality assessment results of the included retrospective cohort study. A (⭐) indicated satisfaction with each item.

Study	Selection	Comparability	Exposure
Tomov et al. (29)	⭐⭐⭐	⭐⭐	⭐⭐
Van Herwijnen et al. (30)	⭐⭐⭐	⭐⭐	⭐⭐
Yamada et al. (33)	⭐⭐	⭐⭐	⭐⭐
Onishi et al. (34)	⭐⭐	⭐⭐	⭐⭐
Lemans et al. (35)	⭐⭐	⭐⭐	⭐⭐
Carballo Cuello et al. (37)	⭐⭐	⭐⭐	⭐⭐⭐
Roberto et al. (38)	⭐⭐⭐	⭐⭐	⭐⭐
Lin et al. (39)	⭐⭐	⭐⭐	⭐⭐