Table 4.

Newcastle-Ottawa quality assessment of observational studies

First author, year	Study design	Selection	Comparability	Outcome	Total score	Result
Bronte V et al[24]. 2020	Cohort	***	**	***	8	Good
Cantini F et al[26]. 2020 (b)	Cohort	***	**	**	7	Good
Giudice V et al[29]. 2020	Cohort	***	**	**	7	Good
Maslennikov R et al[32]. 2021	Cohort	***	**	***	8	Good
Rodriguez-Garcia JL et al[34]. 2021	Cohort	***	**	***	8	Good
Rosas J et al[35]. 2020	Cohort	***	**	***	8	Good
Stanevich OV et al[36]. 2021	Cohort	***	**	**	7	Good
Stebbing J et al[37]. 2021	Cohort	***	**	***	8	Good