Table 2.

Description of quality assessment using the Newcastle‐Ottawa Scale (NOS)

First author name	Country	Selection (1–5 stars)	Comparability (1–2 stars)	Outcome (0–3 stars)	Overall NOS (1–10 stars)
Hugo et al.28	France	**	*	**	5
El Maghraoui et al.27	Morocco	**	*	**	5
Lombard et al.26	South Africa	****	*	**	7
Bokhorst et al.25	Netherlands	**	*		3
Elkan et al.24	Sweden	**	*	**	5
Elkan et al.19	Sweden	**	*	**	5
Metsios et al.23	UK	**	*	***	6
Engvall et al.14	Sweden	**	*	**	5

Asterisks (*) Represents the number of “stars” of quality Newcastle‐Ottawa Scale (NOS).