Table 2. Methodological quality using the Newcastle-Ottawa scale.

Author ID	Selection (maximum 4)	Comparability (maximum 2)	Outcome (maximum 3)	Quality
Chang et al., 2013 [7]	2	1	2	Fair
Bashir et al., 2021 [8]	2	1	1	Fair
Brazil et al., 2021 [9]	2	0	1	Poor
Chang et al., 2017 [10]	2	2	2	Fair