Table 3.

Assessment of the cohort studies by Newcastle-Ottawa scale.

Study (year)	Selection				Comparability	Outcome			Total scores
	Exposed cohort	Nonexposed cohort	Ascertainment of exposure	Outcome of interest		Assessment of outcome	Length of follow-up	Adequacy of follow-up
Why, H. J. F. et al. 1994	★	★	★	★	★★	★	★	★	9
Figulla, H. R. et al. 1995	★	★	★	★	★☆	★	★	☆	7
Fujioka, et al. 2000	★	★	★	★	★★	★	☆	★	8
Caforio, A. L. P. et al. 2007	★	★	★	☆	★☆	★	★	★	7
Kindermann, I. et al. 2008	★	★	★	★	★☆	★	★	★	8
Nowalany-Kozielska, E. et al. 2016	★	★	★	☆	★★	★	★	★	8
Tebbe, U. et al. 2016	★	★	★	★	★★	★	★	☆	8
Karatolios, K. et al. 2017	★	★	★	★	★☆	★	★	☆	7
Kuethe, F. et al. 2017	★	★	★	★	★★	★	★	☆	8
Hjalmarsson, C. et al. 2019	★	★	★	★	★★	★	★	★	9