Table 2.

Inclusion and exclusion criteria

	Inclusion	Exclusion
Population	CHWs are part of the intervention or program	Study does not mention CHWs (or synonyms)
Concept	Intervention or program takes place in PHC (e.g. management of chronic diseases, cancer screenings, etc.)	Intervention or program is not related to PHC (e.g. specialised (cancer) care)
Context	Study needs to be conducted in the WHO-EU region [see Table 1]	Study takes place outside the WHO-EU region
Design	All study designs (quantitative, qualitative and mixed methods)	Not applicable
Year	Published after 2001	Published before 2001
Research question	/	Study does not provide information on at least one of the following elements: CHW role, recruitment, training or remuneration.