Table 1.

Quality assessment of the selected studies using the Newcastle–Ottawa Quality Assessment Scale for cohort studies.

Study		Askling et al. 2002 [32]	Card et al. 2004 [33]	Goldacre et al. 2008 [34]	Landgren et al. 2011 [35]	Elfstrom et al. 2012 [31]	Ilus et al. 2014 [36]	Koskinen et al. 2020 [37]	Lebwohl et al. 2022 [30]
SELECTION (maximum four)	Representativeness of The Exposed Cohort	1	1	1	1	1	1	1	1
	Selection of The Non-Exposed Cohort	1	1	1	1	1	1	1	1
	Ascertainment of Exposure	0	0	0	0	0	0	0	0
	No Outcome of Interest at Start of The Study	0	0	0	0	1	0	0	1
COMPARABILITY (maximum two)	Controlled for confounders	2	2	2	2	2	2	2	2
OUTCOME (maximum three)	Assessment of outcome	1	1	1	1	1	1	1	1
	Follow-Up Long Enough for Outcomes	1	1	1	1	1	1	1	1
	Adequacy of Follow Up of Cohorts	0	0	0	0	0	0	0	1
Score		6	6	6	6	7	6	6	8